Crisis Empire

The is a fictional evil organization from television series Kamen Rider Black RX.
Fictional history
The Crisis Empire is a group of aliens who attempt to invade Earth. They always attempted to justify their invasion and their plans to exterminate the human race. They also claimed that their home planet was being sucked into a black hole. Since they thought that humans do not really care about the Earth, the Crisis Empire thought it was right for them to take over Earth. The group under Jark are based on the battleship.
Strange Demon World
is the original dimensional world where the great Crisis Empire resided. Used to be connected to Earth through dimensional portal in the distant peaceful past until the rise of Grand Lord Crisis. The portal were sealed off by the people of Strange Demon World who opposed the rule of the Emperor. With the dimensional connection severed, the two worlds drifted apart and the past was forgotten. The finale reveals that the Strange Demon World is an exact 'mirror' world of Earth itself.
Grand Lord Crisis blames the dying of their world as an effect coming from the pollution of Earth's environment by mankind, contradicting Professor Walter's explanation that the world's condition was caused by the evil ways of the Crisis Emperor. In the end of the battle, Grand Lord Crisis claimed that as long as mankind lives on "the pollution they caused", there would always be another Strange Demon World. - hinting the possible existence of parallel worlds. His death causes the Strange Demon World to explode as well.
Membership
Among the members of the Crisis Empire are:
Grand Lord Crisis
is the ruling dictator of the Crisis Empire, a giant head with tendrils and three small faces on his forehead, who is not seen but mentioned several times throughout the series yet based on Crisis City at the Empire's home world. His voice was first heard where Gedorian eventually appeased his wrath, later appearing in the shadows to give General Jark the power he requested to have. He eventually offered Black RX the chance to become his new right hand by offering him Earth. When refused, Crisis has host body Dasmader kill him, upon finally revealing himself upon his host's demise. He was destroyed by RX's Revolcane, with his dimension ceasing to exist as a result while claiming his immorality ensured his return as long as evil exists.
General Jark
is a military leader of the empire and supreme commander of the invasion army. Wearing a golden face mask and a black cape, Jark has the loyalty of most under him as he initially leading the attacks until Crisis arrived. He actually does care about his subordinates even to save Maribaron from being killed by Dasmader. Towards the end of the series, he was forcefully transformed by Crisis into a stronger warrior called to kill RX. In the process, Jark Midla easily murdered the Sahara parents and defeated V3 and Riderman while X and Amazon rescued the Sahara children from his grasp. When he was in the middle of battle, the Sahara children tried to kill him but RX as RoboRider shielded the children and transformed into BioRider. He was inevitably killed by RX in a long mortal combat who used the Revolcane on him. Regressed to his normal form and near death, he proclaimed Crisis was too powerful even for RX.
Colonel Dasmader
Sent by Lord Crisis, is an inspector whose task is to put the invasion party back on track, receiving utter contempt by his peers due to his arrogance. Dasmader could fire a green laser, with a shape of a tiger's head from his helmet for combat. He was almost killed by both General Jark and Black RX. He later leads Gatezawn and Bosgun in the attempt to kill Gedorian to appease Crisis' anger. In episode 46, Maribaron discovers that he is somewhat a puppet of Crisis and a mobile body. In episode 47, he was summoned when Black RX refused Crisis' order, killed as a resort as Crisis is revealed upon Dasmader's demise.
Four Officers
The are Jark's four followers who carry out the attacks on Earth.
* : The sorceress of the State, a human-looking officer in black and red armor from a noble family outside the Crisisians with feelings for Jark. She uses the yellow feather on her helmet as a weapon or to send messages, along with using a laser whip and breathe fire. She cares for her comrades, displaying it when Lord Crisis' living heir Garonia dies in a freak accident on their watch and she attempts to cover it up by kidnaping Hitomi to take her place. Though Jark learned the truth, he allows Maribaron to take the girl to the Miraculous Valley to complete her plan. But when Kotaro saves Hitomi, Maribaron is advised by Jark to make a false report that the princess was killed by RX. When Granzyrus arrives, Maribaron revived the spirits of 10 soldiers Kotaro killed to finish off the other riders. She was eventually shocked to learn that Dasmader was Grand Lord Crisis' mobile body, killed by Crisis when she objected on his decision to have RX join them after all the trouble he caused them.
* : Bosgun is a Crisisian dressed in a blue-green naval coat and white tights who wields a jagged sword and dagger. He wears a white helmet with a red visor and a tiny face on his forehead, which seems to be his actual face. He is in charge of the Man-Beast/Mutant unit, occasionally flaunting his Crisisian hertitage to the other officers as he sees them to be inferior to him. He once plotted to take over General Jark but his plans were foiled when one of his swords was destroyed by General Jark himself upon discovering his treachery when he lost to RX twice. He died fighting when he was stabbed by the Revolcane during the arrival of Granzyrus.
* : A blue robotic biker in a leather jacket, slack, and one red eye on his face. In charge of Robot unit, he took to fight Black RX occasionally. He is armed with a blaster and a powerful motorcycle. Gatenzone had the ability to detach his own head from his body. His body could still move on its own without his head. In his final episode, He died fighting Black RX while attempting a suicide bomb (with his head separated from his body) attack, with only his head remaining before it was shattered by his own laser beams reflected by Black RX.
* : A small, unusual creature who owed his life to Jark and is one of his most loyal minions. He is constantly hopping about and annoying everyone else. He is the most cowardly and is quick to ditch a battle before it's even over. He was soon targeted by Dasmader, Gatezone and Bosgun when Grand Lord Crisis was about to destroy them all, but he soon gave his life to ensure the others avoid Crisis' wrath when he transferred his life energy into Gedolridol before his monster died at Black RX's hands.
Others
* : A small robot that announces Jark's arrival before his subordinates and transmits messages from Crisis himself. He was destroyed by Kamen Rider Black RX before the final battle with Dasmader.
* : The Crisis Empire's foot soldiers. They come in three colors: gray, brown and black. They later wear capes. The last of them were finished by the original 10 Kamen Riders before Black RX battles Dasmader.
* : An eagle-like monster which was the Grand Lord Crisis' best soldier and worked with Bosgan when summoned to Earth. The 10 veteran Kamen Rider team arrived to help fight Granzyrus. After killing Bosgan, RX became BioRider upon being doused by the water summoned by Kyoko. BioRider turned into water and rode the water summoned by Kyoko into Granzyrus. Once inside, BioRider brought out his BioBlade and destroyed the monster from the inside out.
Strange Demon
The monsters used by the Crisis Empire are referred to as . There are four branches each led by an Officer. While Granzyrus appears in Earth, Maribaron uses her power to revive members of the each other armies into the
, being greyed versions of themselves before being destroyed by BioRider.
Strange Demon Supernatural Clan
The unit is used by Maribaron.
* : A Grim Reaper-style monster with a scythe and assisted by two Skullmastars. He played a part in Kotaro's rebirth into Black RX. When Skullma and the Skullmastars pulled Kamen Rider Black RX into a nearby pond, there was an explosion after that. Skullma was presumably killed in the explosion as he was not seen again after that. Skullma returned in the Kamen Rider Black RX movie to fight Kotaro before he was sucked into a dimensional warp. Skullma was later revived by Maribaron as part of the Spirit World Kaijin Army.
** : Hornless versions of Skullma. Following Skullma's demise, the Skullmastars live on to serve the Crisis Empire on different occasions.
* : A silver-armored swordsman with ability to harness the sun's rays and use them a weapon as well as move through anything that's reflective. His mission was to steal something from Yousuke Morita, an old friend of Kotaro's. After a brief fight with Bujin, Kotaro learns the blueprints are for a laser the Crisis Empire wants to build. To get the blueprints from Kotaro, Bujin uses Yousuke as a hostage and tricks Kotaro into giving him the blueprints. From there, RX battles Bujin until used his Revolcane to destroy him.
* : An elf-like monster who wielded a blade in battle and could shoot a beam from the crystal on his forehead. Maribaron used Zunojin to attack Reiko in her dreams, taking control of the girl's subconscious in another plan to target Kotaro's weaknesses. With the aid of a dying Karu, RX uses the Crisis Marine's machine to enter Reiko's dream, giving Reiko back control over her dream before killing Zunojin with his Revolcane after a brief hestitation. Zunojin was later revived by Maribaron as part of the Spirit World Kaijin Army.
* : A green and white-furred shaman with bat wings for ears. It is armed with a skull-headed staff and is armed with bananas that can be used as weapons and other stuff. Byakki used his bananas to infiltrate a gold deposity to steal some gold. Joe told Kotaro about a weird old man who bought bananas from his banana stand after following him to his house. Shigeru and his friends stumbled onto his house and ended up captured. When Kotaro arrived and found Shigeru and his friends, the weird old man revealed his true form of Bya Fiend and attacked Kotaro. Byakki threw a banana into Kotaro's chest knocking him out and making off with him. Atop a building, Byakki tried to use a big banana to push the impaled banana in more until Kotaro recovered when it broke when Kotaro used his Robo Rider ability. Kotaro transformed into Kamen Rider Black RX. After some banana attacks from Bya Fiend, Kamen Rider Black RX became Bio Rider. While on Mach Jabba, Bio Rider attacked Byakki and used his liquid powers to evade his banana attacks. Bio Rider broke Bya Fiend's staff before destroying him with his Bio Blade.
* : A plant-covered rock monster who wore an orange loin cloth. He can manipulate soil, split into rocks, and launch the rocks on his body. His stone heart can allow him to regenerate from Black RX's attacks. As a diversion to use a girl to restore a key to the demon world for their invasion, Maribaron sent Ganma to battle RX. When Kotaro was ambushed and pulled underground by Ganma, Kotaro became Kamen Rider Black RX and then became Bio Rider to escape from underground then reverted to Kamen Rider Black RX and fought Ganma before retreating to where Maribaron was. After RX thwarted Maribaron, she used Ganma on Him. During battle, RX discovered Ganma's stone heart and called out his Revolcane which he threw at Ganma's stone heart before fully impaling it which led to Ganma's destruction.
* : A one-horned bluish imp monster armed with a pitchfork. He can shoot a beam from its horn. Maribaron planted him inside Kotaro to kill him when he was being pursued by the police. This was a plan by Maribaron to hack into the city records and make specific people look like criminals. When Wilki became known to Kotaro while he was in jail, he henshined into Kamen Rider Black RX and escaped from jail. Wilki even poked him while he was escaping on Acrobattler. While in the sewers, Kamen Rider Black RX became Bio Rider and found out what Crisis Empire was up to. When the latest person was arrested, Wilki attacked Kamen Rider Black RX to deliver the final blow. Kamen Rider Black RX faked his death and was brought to Maribaron. He eventually became BioRider when Maribaron was about to deliver the final blow. BioRider revealed that his form prevented Wilki from killing him. With all the police computers experiencing a system down, Maribaron retreated and Wilki attacked. BioRider called out his Bio Blade and fought Wilki and the Chaps. BioRider managed to chop off its horn and destroy its pitchfork. BioRider reverted to Kamen Rider Black RX and brought out his Revolcane to disarm Wilki and destroy him.
* : A baboon monster. She appeared in the form of a powerful fortune teller and miracle healer that lured people to help build a city for Crisis. She was killed by RX's Revolcane.
* : A multi-eyed hag monster. She can absorb anyone into her main eye and turn into one big eye. She is Maribaron's grandmother and a somewhat very powerful witch. She absorbed Kyoko into herself and later Kotaro and Joe. However Kotaro transformed into Biorider to escape. He changed back to RX and defeated her by stabbing his Revolcane through her eye form.
Strange Demon Robot
The unit is led by Gatezawn, composed of various androids built by Gatezawn.
* : A robot Gatezawn sent after Kotaro in the guise of man after stealing some of Hayami's clothes. When exposed after his synthetic skin catches fire, Cublican grew a new head after RX knocked his original off: a four-way cannon which attacked RX. Kamen RX absorbed the sun's rays to recharge before calling for Acrobatter, using the Revolcane to destroy Cublican.
* : A large robot with tank treads instead of legs sent to kill RX before he completed Rideron, Gungadin could attack with the guns on his body. Unable to defeat Gungadin on his own, RX tricks Gungadin into thinking he destroryed Rideron while the real car gains life. Offered the title of knight if he killed RX, Gungadin went on a killing spree to force the rider out into the open. With the aid of Rideron, RX managed to defeat the Demon Robot with his Revolcane stabbing him into the head module.
* : A robot that was destroyed by Lord Crisis for being too powerful for the Crisis Empire to control. Gatezawn salvages Scryde and revives the monster, sending him to earth to use discarded items to seal people before having his army attack humans. Though he nearly killed RX, Kotaro escapes with few injuries as he has Rideron and Acrobattler to break Scryde's hold over his garbage army. Once he knocks Scryde's head skin off, RX destroys him with the Revolcane in order to free the humans from within the discarded items.
* : An insectoid robot sent after Kotaro while Hitomi was kidnapped by Maribaron, falling back as RX uses him to enter the Desert of Death after Maribaron. As a result, Deathgaron is attacked by Triplon before he offers his services to Maribaron in return for redemption. However, Deathgaron is deceived and ends up being sealed up with RX as he kills off a replica of Hitomi placed there. This in turn causes RX to transform into RoboRider, breaking out of the sealed room and using his Voltic Shooter to heavily damage Deathgaron. Before he died from his injuries, Deathgaron revealed that Hitomi is still alive and with Maribaron. He returned in the Kamen Rider Black RX movie to assist Gynagiskhan, United Triplon, and Musarabisara into attacking the Kamen Riders only to be destroyed RX's Revolcane.
* : A robot that first appeared in its splintered form: and the humanoid and . Triplon is deployed to the Desert of Death to execute Deathgaron for his incompentence before serving as an escort to Maribaron. When Nexticker is destroyed, the Triplon Units capture Shigeru and overwhelm Kotaro and Joe before they are captured. But when RX achieves the form of BioRider, the Triplon Units dock into which BioRider destroys with his Bio Blade. He returned in the Kamen Rider Black RX movie to assist Deathgaron, Gynagiskhan, and Musarabisara into attacking the Kamen Riders only to be destroyed by a team Rider Kick.
* : A blue robot sent to attack Kotaro while he was looking for Hitomi. Controlling Joe as a puppet, Nexticker forces him to fight Kotaro when he almost saved Hitomi. After surviving the attack, Kotaro is ambushed by Joe while on his to the Valley, fighting him as RX before disabling the robot's mind control abilities. Assuming the form of RoboRider, RX converts Acrobatter to Roboizer and overwhelms Nexticker before blasting him with the Voltic Shooter.
* : A robot that can manipulate heat.
* : A fire-elemental robot. He can manipulate fire. When Crisis Empire was still hording water, people continued to get them from Maribaron's performing troops. After a brief battle with Maribaron, Gatenzawn, and Gedorian, Kamen Rider Black RX went to where the water was being withheld and fought Metaheavy who pulled Kamen Rider Black RX into its fiery location in the factory where it had the advantage. RX became Robo Rider and managed to punch Metaheavy out of the room. After a few shots on Metaheavy with his Vortech Shooter, Robo Rider reverted to RX and destroyed Metaheavy with the Revolcane, then used the Revolcane to destroy the controls that was withholding the water. Thus, the water was returned to the city. Metaheavy was later revived by Maribaron as part of the Spirit World Kaijin Army.
* : An electrical robot. Elgitron was later revived by Maribaron as part of the Spirit World Kaijin Army.
* : An Asura-like robot. He wields a spear, two swords, a sickle and a pitchfork in battle. He can also spew acidic foam from his hands. Disguised as a headmaster, he helped General Dasmander (disguised as a female worker) and Gatenzone manipulate ESP children into causing the country to split from the continent. Kotaro encountered Schraigin in the first encounter. Kotaro henshined into Kamen Rider Black RX and fought Schraigin. When Kotaro found where the other ESP children are, he was discovered by Dasmander, Gatenzawn, and Schraigin. Schraigin fought Kotaro before shedding his disguise. Kotaro transformed into Robo Rider and fought the Chaps and Schraigin. After the machine hooking the ESP children to it was destroyed, Dasmander and Gatenzawn fled as Robo Rider engaged Schraigin outside. Robo Rider reverted to Kamen Rider Black RX and used the RX Kick on him. Kamen Rider Black RX called out his Revolcane and disarmed Schraigin before using the Revolcane to destroy him.
* : A robotic race car-resembling monster. He was used to capture children and transform them into killer machines with the Strange Demon gun computer to kill Black RX. He was destroyed by RX's Revolcane.
* : A silver humanoid robot. He can shoot his fists out like missiles. He was commanded by Gatenzawn and battled alongside him.
Strange Demon Beast-Man
The unit is led by Bosgun, composed of mutants and animal-like humanoid aliens.
* : Known as the , Gynagiskhan was an insectoid-like horseman with sensitive hearing who used a glaive in battle and manipulate winds up to 100 MPH. He brought Kotaro and his friends into the Desert of Fierce Winds where Walter and followers were exiled. After killing Walter, Gynagiskhan battles RX with Reiko's musical necklace disrupted Gynagiskhan enough for RX to kill him with the Revolcane. He returned in the Kamen Rider Black RX movie to assist Deathgaron, United Triplon, and Musarabisara into attacking the Kamen Riders only to be destroyed by a team Rider Kick.
* : A three-eyed green moth monster who based himself at cave for his experimentation to revive the deadly Gaina Moth from extinction, altering their venom so the infected have an hour before mutating into humanoid Gaina Moths. With Reiko, her teacher, Shigeru, and his friends stumbled into it and are trapped within the cave and poisoned as a result, Kotaro attempts to deliver the curse with Gynagamoth attacking him. Using Rideron to hold off Gynagamoth, RX manage to cure his friends before killing him with the Revolcane, causing the Gaina Moths to die out as a result.
* A black-haired crab-like monster with shape shifting powers who is sent after a girl named Tomoko, who is half Crisisian on the side of her father is about to awaken her powers. Though Kotaro interfered, Gynamite assumes the form of the girl's father to get her, only she uses her Crisisian powers to knock him into his true form as Kotaro arrives and becomes RX to fight him, chopping his pincer off before the monster used his toxic breath on him. Gynamite tried again to take the girl who used her Crisisian powers on him. RX used his RX Kick on Mite before he was destroyed by RX's Revolcane.
* : An unspecified monster with long horns and blue black and white spot over his body who commanded by Bosgan. Besides attacking with his horns, he also wields a sword in battle. Bosgun has invented a machine that turns people into humanoid animals (mostly pigs). When Gynabalas was sent to obtain a kid who was turned into a humanoid gorilla, he ended up in conflicted with Kotaro who became Kamen Rider Black RX until the kid returned and attacked Gynabala. Joe disguised himself as a humanoid pig version of Kotaro to let Bosgun, Gynabalas, and the Chaps capture him. When Kamen Rider Black RX arrived, Joe shed his disguise and Kamen Rider Black RX fought Gynabalas which destroyed the machine that turned people into animals and restored the people back to normal. Kamen Rider Black RX fought with Gynabalas until their fight leads outside of the factory. When Gynabalas managed to hit Kamen Rider using his sword, Kamen Rider called out his Revolcane to disarm Harmful Brass. When Gynabalas's sword was hit off by Kamen Rider's Revolcane, Kamen Rider use his sword to slash into Harmful Brass's stomach. This make him seriously injured and was destroyed after Kamen Rider pulled out his Revolcane.
* : A black-haired lizard/mantis monster. He can detach the blades on its back to throw them and use them as weapons. He is commanded by Bosgun who accompanied him to attack Kotaro where Gynakamakil manipulated aluminum cans. In the second time, Joe disguised himself as a bride to lure out Gynakamakil. While Kotaro and Joe were fighting Gynakamakil, Bosgun used his new sword on the car that Reiko was hiding in and made off with her. When Kamen Rider Black RX caught up to where Bosgun and the Chaps had the other brides, he ended up fighting Bosgun and Gynakamakil. Kamen Rider Black RX became Robo Rider where Bosgun's sword could not penetrate him which ended up destroyed by Robo Rider followed by an attack on Gynakamakil. Robo Rider reverted to Kamen Rider Black RX and destroyed Gynakamakil with his Revolcane. Gynakamakil was later revived by Maribaron as part of the Spirit World Kaijin Army.
* : A long-necked turtle monster. He can bite, launch his head and neck out to constrict, and shoot sparks from his mouth. He is commanded by Bosgun. Gynagingam caused Reiko to be hospitalized and had Utako give a message to Kotaro where to meet him. When Kotaro arrived at the designated location, Gynagingam attacked. Kotaro henshined into Kamen Rider Black RX and fought Gynagingam until Bosgun arrived with his new sword that can penetrate his Robo Rider form when Kamen Rider Black RX became Robo Rider and ended up reverting to Kamen Rider Black RX after some blows from Bosgun's sword. Kamen Rider Black RX called Acrobattler and retreated. When Shigeru and Hitomi end up captured by Bosgun, Gynagingam, and the Chaps, a weakened Kotaro fought Bosgun and Gynagingam while Joe freed Shigeru and Hitomi. After Joe was wounded by Bosgun, Kotaro transformed in Bio Rider and fought them. Bio Rider was caught by Gynagingam and turned into water to escape and evade Bosgan's sword. After being disarmed, Bosgun retreated. Gynagingam was beheaded by Bio Rider who reverted to Kamen Rider Black RX and destroyed Gynagingam with the Revolcane.
* : An ape monster that leads the Devil Beastman Ninja Corps. Gynaninpo wields an extending staff in battle which he can shoot beams from it. He can also assume the form of anyone. The Devil Beastman Ninja Corps attacked a mountain village and captured its inhabitants. He and the Devil Beastman Ninja Corps attacked Kotaro and Reika when they were in the woods only to be saved by Joe. Joe infiltrated the building that Bosgun had the prisoners in disguised as a Devil Beastman Ninja until his coughing gave him away to Bosgun and Gynaninpo. Gynaninpo took out Joe and assumed his form. Gynaninpo sent the Devil Beastman Ninja Corp to attack the place where Kotaro and Reika found the kids taking refuge. Kotaro fought them until "Joe" defeated them and led them to where Bosgun has the prisoners. After Kotaro finds the real Joe, Gynaninpo sheded his disguise. Bosgun revealed his plans to Kotaro and left as Gynaninpo and the Devil Beastman Ninja Corps fights Kotaro. Kotaro henshined into BioRider and frees the prisoners. BioRider and Gynaninpo fought outside as BioRider destroyed his Devil Beastman Ninja Corps. BioRider called for Mach Jabba and charged him. Gynaninpo climbed a cliff and attacked BioRider. BioRider turned into water to attack him and knocked him off the cliff. BioRider reverted to Kamen Rider Black RX and used his Revolcane to disarm Gynaninpo before destroying him. Gynaninpo was later revived by Maribaron as part of the Spirit World Kaijin Army.
* : A tiger-like monster. He can punch, bite, and is armed with small black boomerangs. He is under Bosgan to fight Kotaro. While Kotaro transformed into Kamen Rider, they fought and Gynajagram use his boomerangs to attack. Then Kamen Rider transformed into RoboRider and shot him. When Gynajagram wanted to attack RoboRider, Roborider turn into BioRider and attack back. When Biorider take out his Bio Blade, Gynajagram also use two boomerang to fight. When his boomerang was hit off by Biorider's Bio Blade, he still want to attack with free hand. Finally, Gynajagram was slash by Bio Rider's Bio Blade.
Strange Alien Lifeforms
The unit is led by Captain Gedorian, mostly consisting of alien lifeforms and animals.
* : Toad-like parasites that thrive in warm areas, able to spew foam from their mouths that induce a high fever in their human victims before laying their eggs in them so they can serve as both incubators and their offsprings' first meal. Three Culculten hatch, use the Sahara house as their base of operation and attempt to kill Kotaro until Shigeru uses ice cubs to drive them off. When encountered again, the Culculten manhandle Kotaro until he becomes RX to out wrestle them before using the Revolcane to kill them each, with their destruction the effects of their foam wore off. A Culcuten was later revived by Maribaron as part of the Spirit World Kaijin Army.
* A monster composed of jaw-like pincers. He was sent by Gedorian without Jark's consent to turn the Sahara family in cacti-slaves that attack RX until he is forced to fall back when the effects wear off. But Maribaron offers her aid to Gedorian by tricking a girl named Chika into giving up her life to Atechpetchy so his power can be perfected. But RX ruins the scheme and use the Acrobatter to destroy Atchpetchy with his Revolcane.
* A slithering grayish-white blob-like monster with tentacles for arms, able to spray his slime on them with the slime morphing into a clone. Dogmalogma uses his power to create clones of Shigeru, his frieds, and Reiko as part of Maribaron's plan to use those Kotaro trusts against him. But once he becomes RX, his Kingstone causes the clones to dissolve before he battles Dogmalogma. When the monster attempts to engulf his hostages, RX stops and Dogmalogma kills him with the Revolcane.
* : A jellyfish-like alien parasite with teleportation abilities sent to obtain the G Crystal that was stolen by a rogue Crisisian scientist and his daughter Kirara, with RX driving him away as Kirara learns the G Crystal is found by Shigeru and Kengo. Flarmiglarmi later enters Kirara's body, getting the G Crystal from Shigeru as Kotaro arrives. In spite of warning Flarmiglarmi the danger the G Crystal poses for both worlds, RX is forced to fight him with the Arcobattler before killing him with the Revolcane to destroy the G Crystal and the machine it powered.
* : A flying squirrel/bat monster. It can breathe fire, use its fangs to inject a toxin, and shoot electrical beams from its eyes. It was used to turn Shigeru and other children into vampires. Kotaro ended up bitten by Shigeru. During battle with Musalabisala, Kotaro was bitten again. Kotaro became Bio Rider to get the injected fluid in him out. Kotaro tricked Musalabisala into thinking that he fell under his control. After the trick worked, Kotaro henshined into Kamen Rider Black RX and fought him. Musalabisala had RX in a pinch until Joe throws one of his sais at him. Kamen Rider Black RX used the RX Kick on Musalabisala before destroying him with the Revolcane. He returned in the Kamen Rider Black RX movie to assist Deathgaron, United Triplon, and Gynagiskhan into attacking the Kamen Riders only to be destroyed by a team Rider Kick.
* : A blue monster who can shapeshift and transform into a shadow. He attacked Joe when he was with an old friend of his named Saila to obtain her necklace and ended up injuring Joe. Luckily, Kotaro transformed into Kamen Rider Black RX to battle Bang-Gong. Kamen Rider Black RX got them to safety in Ridron which also tackled Bang-Gong. Bang-Gong later kidnapped Saila. When Joe and Kotaro found her in an abandoned warehouse, they were ambushed by Bang-Gong and the Chaps. Kotaro transformed into Kamen Rider Black RX and fought him. When Bang-Gong swiped the necklace, Kamen Rider Black RX became Bio Rider and followed Bang-Gong outside. Bio Rider took back the necklace. Bio Rider called forth his Bio Blade to cut off Bang-Gong's antennas and then kill him with it before getting Joe and Salia out of the warehouse before the bomb planted by Gedorian blew it up.
* : A white-haired ant monster. He can create tornadoes and manipulate soil to bury people. He attacked a playground and its surrounding areas until Kotaro and Joe battled him. Kotaro transformed into Kamen Rider Black RX to fight Ant Runt (with Shadow Moon secretly observing the battle). When Ant Runt created a boulder, Kamen Rider Black RX became Robo Rider. Robo Rider proved useless against Ant Runt as the monster clogged all of Robo Rider's joints with dirt. Becoming Bio Rider, he easily maneuvered against Ant Runt causing the monster to retreat and everyone becoming unburied. He and Gedorian later crashed the battle between Bio Rider and Shadow Moon. Ant Runt trapped Bio Rider and Shadow Moon in an anthill. Ridron freed them and Bio Rider turned into water to attack Ant Runt. Bio Rider reverted to Black RX and destroyed Ant Runt with the Revolcane. Antront was later revived by Maribaron as part of the Spirit World Kaijin Army.
* : A lobster-resembling monster with scythe-blades for hands and lobster legs between its upper back and shoulders. It assisted Gedorian into turning the people into vampires. When Kotaro stumbled upon one of the victims attacking people in the car, he saved one of them before Likback attacked. Kotaro transformed into Kamen Rider Black RX to fight Likback before the monster retreated. After an ambush by Chaps, Kotaro transformed into Kamen Rider Black RX and fought Lickback and the Chaps while Joe tries to free Lickback's hostage and fight the victims at the same time. A kick at Lickback revealed a glowing part on it. Once Kamen Rider Black RX used his Revolcane on that part destroying Rik Back, his vampire victims were freed.
* : A white-haired anteater monster with crab claws for hands. The Crisis Empire used it to dig into a mountain to cause a volcanic eruption until Shadow Moon took over it. When Kamen Rider Black RX encountered Matbot, it attacked the other Crisis Empire officers who fought back. Kamen Rider Black RX escaped the cave-in and ended up engaging Shadow Moon. Gedorian disciplined it in their base and General Jark told Gedorian to use Matbot to capture two children for revenge on Shadow Moon. After defeating Shadow Moon, Kamen Rider Black RX became Robo Rider and fought Matbot underground who went above ground while Robo Rider disarmed the bombs. Acrobattler tackled Matbot and Robo Rider used his Vortech Shooter to blast off his right arm. Robo Rider reverted to Kamen Rider Black RX and destroyed Matbot with the Revolcane.
* : A scaley ostrich/dragon-like creature that had small dragon-like heads for hands and an extra mouth on its belly. He can breathe fire from his main head, shoot electricity from the dragon-like heads, breathe steam from the extra mouth, and attack with his tail. Crisis Empire used Gimelagomela to turn people into butterflies and infect people so they would be under their control. When it attacked a boy, Kamen Rider Black RX came to save him and battled Gimelagomela until the victims arrived to help Gimelagomela. Kamen Rider Black RX called for Acrobatter to tackle Gimelagomela until he used his steam attack on Kamen Rider Black RX. General Dasmander came into view to have his fight with Kamen Rider Black RX and told Gimelagomela to stay out of it. During battle, Gimelagomela and his victims interfered and attacked Kamen Rider Black RX. When Kotaro followed the butterflies to their source, Gimelagomela attacked. Kotaro transformed into Kamen Rider Black RX and fought Gimelagomela. Kamen Rider Black RX used his RX Kick on Gimelagomela before destroying Gimelagomela with his Revolcane.
* : A flea-like monster. He can launch the stinger from his mouth and shoot lasers from its eyes. Mundayganday was the one responsible for killing Kyoko Matoba's parents. He, Gedorian, and the Chaps were attacking a reservoir in hopes it can stop the flow of water in the city and Maribaron was delivering water to people. When Kotaro, Reiko, and Kyoko arrived at the reservoir and were attacked by Mundayganday Kotaro transformed into Kamen Rider Black RX and fought Mundayganday until Gedorian and the Chaps trapped him a slime-like substance shot from their guns. Kamen Rider Black RX became Bio Rider and destroyed Munde-gande's exo-skeleton with his Bio Blade. Bio Rider reverted to Kamen Rider Black RX and destroyed Mundayganday with his Revolcane.
* : A brown lobster-like monster with octopus tentacles on his hips and smaller ones for hair. He can shoot lasers from his claws. He assisted Crisis Empire when it came to blowing up Setoo Bridge. When Kotaro confronted Gazolagezola on a boat, he transformed into Kamen Rider Black RX and discovered Crisis Empire's plans during battle. As Bio Rider, he used his Bio Blade on Gazolagezola's stomach and removed the time bomb in him and threw it into the water. Gazolagezola went underwater and Bio Rider turned into water to follow him to land. After getting out of Gazolagezola's trap, Bio Rider followed it and reverted to Kamen Rider Black RX. He used his RX Kick on Gazolagezola before destroying him with the Revolcane.
* : A one-eyed alien monster with an elephant-like trunk for a mouth. It can shoot a beam from its eye, and spew steam from its trunk. It disguised itself as a masked wrestler and brainwashed kids into rooting for him including Shigeru and his friends. When fighting in a re-match against his latest opponent, it turned out that Bio Rider merged with Balunbolun's opponent and Balunbolun shed his disguise. As the boxer got everyone out of the building, Bio Rider fought Balunbolun who made off with a boy. After turning into water and catching up to Balunbolun, Bio Rider reverted to Kamen Rider Black RX and fought Balunbolun. Acrobatter tackled Balunbolun freeing the boy. Kamen Rider Black RX used his RX Kick on Balunbolun before destroying it with his Revolcane.
* : A louse-like alien that absorbs energy from machines or living things with his mouth-like hands. Gedorian sacrificed his life energy to power it up. He was destroyed by RX's Revolcane.

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