While on a trip to Africa, he was bitten by a cobra and was saved by a transfusion of mongoose blood and soon discovered he developed super-speed. After returning home, he decided to become a crime-fighter. During World War II, Bucky (James Barnes) invited Robert to join the Liberty Legion
and rescue the Invaders
, who had been brainwashed by the Red Skull. When the Liberty Legion and Invaders eventually disbanded after the war, the Whizzer joined the newly-formed All-Winners Squad
. Years later, the Whizzer reappeared as an aging hero who married the super-heroine, Miss America. He briefly served with the Avengers
, who aided him in controlling his son, Nuklo
. After being defeated by the super villain Count Nefaria
, Robert decided to retire. He later returned to fight a final battle against an old war-time foe called Isbisa
. The Whizzer died fighting Isbisa, but his sacrifice enabled Nuklo to begin a normal life.