Chuck Grayson(assistant of the original Robotman)

Dr. Chuck Grayson was the assistant to Robotman (Dr. Robert Crane a.k.a. Paul Dennis). Some time in the 1950s, Robotman disappeared. When Chuck Grayson later died, he left instructions to freeze his body in order to donate it to Robotman in the event that he should return. Robotman did eventually return, and his brain was transplanted into Chuck Grayson's body, giving Dr. Robert Crane a new life as a human being. The Earth-Two Chuck Grayson was a cousin of Dick Grayson (Robin).