- Jim Piersall as Arthur
- John Piersall as Buster
- Mary Piersall as D.W.
- Dr. Brown as Mr. Haney
- Mrs. Piersall as Muffy
- Young Jim Piersall as Binky
- Reporter Slade as Mr. Ratburn (uncredited)
- Joe Cronin as Pal (uncredited)
- and more
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