Government of Darkness
Government of Darkness' first 16 cyborg mutants were based on Greek and Roman mythology, after that they're a cross between animals and historical or fictional figures.
Neptune: episodes 1, 27 & movie (height 178cm, weight 83kg)
Medusa: episodes 4, 21, 27 & movie (height 197cm, weight 105kg)
Minotaur: episode 6 (height 189cm, weight 98kg)
Chief of Security Apollo Giest: episodes 8-14 (height 185cm, weight 75kg)
Atlas: episode 8 & movie (height 150cm, weight 60kg)
Prometheus: episode 10, 21 & movie (height 196cm, weight 102kg)
Chimera: episodes 12, 27, movie (height 173cm, weight 80kg)
Revived Apollo Giest: episodes 16-21 (height 190cm, weight 85kg)
Chronos: episodes 15 & 16 & movie (height 184cm, weight 76kg)
Alseides: episode 17 & movie (height 175cm, weight 65kg)
Ogle-Dagger: episode 19 (height 175cm, weight 69kg)
King Dark: episodes 22-35
After the defeat of Apollo Giest in episode 21 Kamen Rider X hears the voice of King Dark (Wada, Fumio), mocking him. King Dark (height 6 meters, weight 5 tons) is first seen in episode 22. Kamen Rider X first meets King Dark in the movie and then again in episode 32. The final battle comes in episode 35.
Genghis Khan-Condor: episode 22 & movie (height 191cm, weight 86kg)
Scorpion-Geronimo: episodes 22, 23, 24 (height 196cm, weight 89kg)
Franken Bat: movie (height 180cm, weight 79kg)
Starfish-Hitler: episode 26 (height 183cm, weight 91kg)
Chameleon-Phantom (height 178cm, weight 84kg) / Government of Darkness Rider: episode 29
Leech Dracula: episode 30 (height 169cm, weight 73kg)
Ant-Capone: episode 32 (height 169cm, weight 78kg)
Tiger Nero: episode 34 (height 180cm, weight 78kg)
Although the final episode (35) of Kamen Rider X reveals the insane Dr. Norai (once a friend of Jin, Keisuke's father) to be in command of the Government of Darkness, the leader of the Delza Army, in Kamen Rider Stronger, will claim to have formed all the terrorist groups from Shocker through the Delza Army, that includes the Government of Darkness.
"Government of Darkness March" Lyrics
Mutant names translated by James Holman. Logo provided by Igadevil.