While on a trip to Africa, he is bitten by a cobra and is saved by a transfusion of mongoose blood. He soon discovers he has developed superspeed. After returning home,he decides to start fighting crime. During World War II, Bucky (James Barnes) invites Robert to join the Liberty Legion and rescue the Invaders, who have been brainwashed by the Red Skull. When the Liberty Legion and Invaders eventually disband after World War II, the Whizzer joins the newly-formed All-Winners Squad. Years later, the Whizzer reappears as an aging hero who had married fellow superhero Miss America. He briefly serves with the Avengers, who aid him in controlling his son Nuklo. After being defeated by the supervillain Count Nefaria, Robert decided to retire the whizzer. He later returns to fight a final battle against an old war-time foe called Isbisa. The Whizzer dies fighting Isbisa, but his sacrifice enables his son uklo to begin a normal life.