- Buster Crabbe
- Kaspa the Lion Man
- Frances Dee
- Ann Rogers
- Sidney Toler
- Neil Forbes
- Nydia Westman
- Sue
- Robert Barrat
- Joe Nolan
- Irving Pichel
- Corey
- Douglass Dumbrille
- Ed Peters
- Sam Baker
- Gwana
- Patricia Farley
- Kitty
- Ronnie Cosby
- Kaspa at age three
- Robert Adair
- John C. Knolls
- Thomas Amos
- (uncredited)
- Florence Britton
- Mrs. Edith Knolls
- Don Brodie
- Reporter
- Leonard Carey
- Clerk at Hunting License Bureau
- Nora Cecil
- Spinster in Park
- William R. Dunn
- (uncredited)
- Harold Farley
- (uncredited)
- Sam Farrell
- (uncredited)
- William J. Kelly
- Government Inspector
- Fred Kelsey
- Cop
- Edward LeSaint
- Policeman
- Tom London
- Lion Attendant
- Lee Phelps
- Customs Inspector
- F.M. Pitts
- (uncredited)
- Warner Richmond
- Gus
- Mabel Stark
- Spinster in Park
- Harry Strang
- Lion Attendant
- Phil Tead
- Reporter
- George Turner
- (uncredited)
