Hugh O'Connell

as Charlie

as Chief of Police

as Muirhead

as Lawrence Watkins

as Niagara Clerk

as Johnson

as Professor (archive footage) (uncredited)

as Professor Caligostro

as Newell Morse

as Skinner

as George Dunlap

as John J. Oldham

as Hotel Clerk

as John C. Allyn

as Virgil Whitaker

as Mike Forrester

as Hughie Sprague

as Truman Hardy

as Charles B. Horsley

as Dudley Stone

as Windy

as Speed

as Sergeant McLeash

as Greg Haywood

as Warren

as Steve Wilson

as Patsy

as Chuck Haskins

as Dr. Carver

as Kipp

as Charlie Rickenbacker

as Niki's Orderly