|This article is about a/an kaijin in Kamen Rider X.|
Revived by King Dark, Medusa was sent with Chimera to back up Neptune, who had failed to damage the image of the Kamen Riders. The three G.O.D. monsters were met by not only X-Rider, but Kamen Rider V3 as well. Medusa was quickly defeated by X-Rider's X Kick, colliding into Chimera. Soon after, Neptune was beaten by V3 and X-Rider, the latter of whom used his Rider Kick to propel him into his fallen comrades, causing all three of them to be destroyed in an explosion.
Medusa has the ability to fly, summoning snakes and turn human into stone with her eyes.
|Redizer - Perfecter - Ridol - Mercury Circuit - Cruiser|
|Tōbei Tachibana - Chiko - Mako - Kiriko Mizuki - Ryoko Mizuki - Keitaro Jin|
|Takeshi Hongo - Hayato Ichimonji - Shiro Kazami - Joji Yuki|
|Government of Darkness|
|King Dark - G.O.D. General Commander - Dr. Noroi|
|Apollo Geist - G.O.D. Warfare Agents|
|Neptune - Pannic - Hercules - Medusa - Cyclops - Bull Man Minotaur - Birdman Icarus - Mighty Atlas - Mach Achilles - Flaming Prometheus - Hydra - Chimera - Ulysses - Reaper Chronos - Cerberus - Alseides - Cateus|
|Ogle-Dagger - Salamander-Gong - Ghengis Khan-Condor - Toad-Goemon - Scorpion-Geronimo - Horned Beetle-Lupin - Franken Bat - Starfish-Hitler - Spider-Napoleon - Chameleon-Phantom - Leech Dracula - Lizard-Viking - Ant Capone - Centipede Youkihi - Tiger Nero - Scorpion-Geronimo Jr.|
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