Freddie Bartholomew
— Freddie Hewlett
Billy Halop
— James 'Jimmie' Fletcher
Huntz Hall
— Bushy Thomas
Bobby Jordan
— Jockey
Boyd Davis
— Maj. E.C. Carter - Academy Commandant
William Blees
— Cadet Capt. Wesley Rogers
Richard Noyes
— Cadet Sgt. Sable
Joseph Crehan
— Mr. Jeffrey Ferguson
Don Beddoe
— Saginaw Jake
Charles Lind
— Cadet Pell
Billy Lechner
— Cadet Baker
Peter Lawford
— Cadet Wilbur
Rudolph Anders
— Horner - Nazi Saboteur (as Robert O. Davis)