Ben "Rocky" Grimm was a senator was romantically involved with June Masters. During a battle with Galactiac, he was temporarily transformed into a four-armed rock-like creature. After being freed from Galactiac's control and reverting back into his normal self, Rock felt that some sort of device should be constructed that would allow him to control his powers. Prof Richards is currently working on such a device.
As the Four-Armed Thing, Rocky possesses superhuman strength and durability.