Sprang thereafter worked almost entirely on Batman comics and covers and on the Batman newspaper strip, becoming one of the primary Batman artists in the character's first 20 years. In 1955, Sprang got the chance to draw Superman, when he replaced Curt Swan as the primary artist for the Superman/Batman team-up stories in "World's Finest Comics", on which he worked until his retirement in 1963. Sprang also worked on a couple of stories for the main "Superman" comic, "including the tale that introduced the first, prototype Supergirl".