Ghoster is a magma monster who appears in Kamen Rider, as well as in several Kamen Rider movies. He fights Kamen Rider #1 and Kamen Rider #2's and is destroyed by their Rider Double Kick.
Super Hero Taisen
Ghoster was revived as part of Dai-Shocker in the Super Hero Taisen incident, led by Tsukasa Kadoya/Kamen Rider Decade, rivaling Captain Marvelous/Gokai Red and Dai-Zangyack. However, Rider Hunter Silva of Dai-Zangyack and Doktor G of Dai-Shocker overthrew their respective leaders and joined forces to destroy the Kamen Riders and Super Sentai. The two evil organizations united and faced off against the combined forces of the Sentai and Riders. He is seen fighting Clover King of JAKQ and Kamen Rider V3. During the final battle, Ghoster was killed by Kamen Rider OOO's finishing attack with his Medajalibur, the OOO Bash along with Hades God Dagon, Scorpion Man, and Isoginjaguar.
Super Hero Taisen Z
Ghoster have revived again and be part of Space Shocker member.
Kamen Rider Taisen
Scorpion Man revived once again with other Kaijins, and join Underground Badan Empire. He led force by Tiger Roid, Yamaarashi-Roid and Kamen Rider Fifteen to invade the surface and attack the Armored Riders to kidnap Shu for plans. When the Space Break System has risen, Generalissimo of Badan summon other Leaders, Kaijins, henchmen army to eliminate Ryo Murasame and Gaim. Ryo reveal Heisei and Showa Riders that they supposedly been defeated had in fact been sent to Helheim Forest, to help support Ryo and Kamen Rider Gaim. dan Army battling the riders, Generalissimo of Badan reveals itself as a giant tyrannosaurus head monster started to attack on Riders and the armies.