"Two-fisted" senator Benjamin "Rocky" Grimm was a founding member of the Challengers of the Fantastic. He was romantically involved with June Masters, the robotics expert whom he accidentally blinded in a confrontation with Diablo the Volcano Man. During the battle with Galactiac, Grimm was temporarily transformed into the "Four-Armed Thing" and was forced to do Galactiac's bidding. After he reverted back into his normal self, Grimm felt that some sort of device should be constructed that would allow him to control his transformation into the Four-Armed Thing.
