Captain Courageous is a supernatural being, a "Spirit of Courage" that appeared when brave men and women ask for courage. During World War II Captain Courageous responded to Americans' pleas and appeared to help the Allies. He had super strength, flight, limited invulnerability, and could survive unaided underwater. In Four Favorites #21, Captain Courageous willingly gave up his costume and joined the U.S. Navy civilian soldier. He stopped using his powers and continued to fight crime and surviving Axis agents.