Height: 40 m
Weight: 32 tons
Artificial Intelligence specialized in quick movements. Appears in Episode 34, in which Ryu steals a disk about Tetra Boy's weaknesses to bargain for Rie. After being stopped by Gai, Ryu steals the robot itself and Grey takes it to the Vyram. Hidden in Tetra Boy was the real Ryu, he had sent an android to Grey which he killed. The Jetman managed to get Tetra Boy back and used him against Toxic Rat in Episode 35. It was sliced to pieces by Raguem in the final battle.
Tetro Boy changes in a cannon used by Jet Icarus, Jet Garuda and Great Icarus.