 Beck's more cartoony artwork for the Captain Marvel stories.Whereas Captain Marvel changed identities by saying "Shazam", Captain Marvel Jr. says "Captain Marvel" to transform; this was intended to serve as a frequent reminder to readers to buy the Captain Marvel Sr. books.Captain Marvel Jr.'s first appearance in "Whiz Comics" #25 was part of a three-issue crossover between "Whiz Comics" and another Fawcett publication, "Master Comics", in late 1941.