as Niki's Orderly

as Lawrence Watkins

as Chief of Police

as reporter Virgil Whitaker

as John C. Allyn

as Hughie Sprague

as Chuck Haskins

as Mike Forrester

as George Dunlap

as Hotel Clerk

as Newell Morse

as Dudley Stone

as Sergeant McLeash

as Warren

as Greg Haywood

as Truman Hardy

as Windy

as Charlie

as Skinner

as Charlie Rickenbacker

as Kipp

as Professor Caligostro

as Patsy

as Johnson

as Niagara Clerk

as John J. Oldham

as Charles B. Horsley

as Dr. Carver

as Speed

as Steve Wilson

as Muirhead

as Professor (archive footage) (uncredited)

as Himself