character - Charlie

character - Chief of Police

character - Muirhead

character - Lawrence Watkins

character - Niagara Clerk

character - Johnson

character - Professor (archive footage) (uncredited)

character - Professor Caligostro

character - Newell Morse

character - Skinner

character - George Dunlap

character - John J. Oldham

character - Hotel Clerk

character - John C. Allyn

character - reporter Virgil Whitaker

character - Mike Forrester

character - Hughie Sprague

character - Truman Hardy

character - Dudley Stone

character - Charles B. Horsley

character - Windy

character - Speed

character - Sergeant McLeash

character - Greg Haywood

character - Warren

character - Steve Wilson

character - Patsy

character - Chuck Haskins

character - Dr. Carver

character - Himself

character - Kipp

character - Charlie Rickenbacker

character - Niki's Orderly