Percival "Pinky" Pinkerton was a member of the Howling Commandos in the 1940's. Shortly after World War II, he and fellow Howling Commandos Dum Dum Dugan, Happy Sam Sawyer, and Junior Juniper assisted Peggy Carter and the SSR on a mission in Belarus to uncover Howard Stark's connections to the Russian spy organization known as Leviathan.