Grax

A four-armed, blue-skinned extra-terrestrial rival of Brainiac who in October 1966 uses his 20th level intellect to defeat Brainiac with his 12th level intellect and steals his force field as part of his plot against Superman who he seeks revenge against for having thwarted his past schemes. He tells Brainiac, "Only last month, he cruched my arny of robot invaders... before that, he had beaten my disc machines when they stole Venusian radonite."

Grax then uses a rocket to attach a bomb capable of destroying the earth to Superman warning him if he removes it it will explode. When Superman tries to leave the earth for its own safety he finds that he cannot for Grax has surrounded the planter with Brainiac's force field which he has reinforced with red sun energy. Grax tells Superman that the bomb will soon destroy the earth and there is only one way he can prevent this.

However, Brainiac, seeking his own revenge against Grax, contacts Superman and instructs him how the construct an enormous magnet that traps Grax's ship against the force field. Positioning himself just inside the shield next the Grax's ship, Superman warns Grax that the bomb only has one minute left on its timer. Realizing the the shield will not be strong enough to protect him from the blast at such close range Grax begins to instruct Superman on how to deactivate the bomb. But with five seconds left to detonation it is too late. In a panic Grax creats a hole in the force field to allow Superman to enter his ships hoping the he can still deactive the bomb himself.

However, the bomb explodes. Superman's invulnerable body is unaffected and the combined protective power of the force shield around Grax's ship and the one around the earth protect it from the blast. Grax escapes destruction by transforming himself into a phantom at the last moment. Superman then returns Brainiac's force field to him saying that he owes it to him. (Act No. 342: "The Super-human Bomb!")

Other appearances Act Nos. 417, 481, Super Friends No. 7, 8, 9, 38.