|Episode:||The Mashima Deathmatch|
|Season:||Uchuu Keiji Shaider|
|Voice Actor:||Eisuke Yoda|
Deathdeath (デスデス Desudesu?): A scaly gladiator-themed Fushigi Beast in a green fur mantle with horns on his head. Posing as a caesar-like figure, Deathdeath oversaw the combat between Girda and Billy Shinigami, converted into Fuuma cyborgs, massacre athletes kidnapped and drugged by Fuuma. One learning the truth, Shaider defeats the cyborgs and frees the athletes before chasing Deathdeath into the Fushigi Dimension, knocking the monster's sword away and then destroys him with Shaider Blue Flash. Its powers include a human disguise, bull horns, a sword, teleportation, size changing and pink energy balls from the hands.