As novice detectives, Bud and Lou come face to face with the Invisible Man.
Charles Lamont
Director
George Robinson
Ronald R. Rondell
Joseph Gershenson
Bud Abbott
Bud Alexander
Lou Costello
Lou Francis
Nancy Guild
Helen Gray
Arthur Franz
Tommy Nelson
Adele Jergens
Boots Marsden
Sheldon Leonard
Boots Morgan
William Frawley
Det. Roberts
Gavin Muir
Dr. Philip Gray
Sam Balter
Radio Announcer
John Daheim
Rocky Hanlon
Walter F. Appler
Professor Dugan (uncredited)
Bobby Barber
Sneaky (uncredited)
Howard Banks
Officer (uncredited)
Richard Bartell
Bald Man (uncredited)
Phil Bloom
Fight Spectator (uncredited)
John Breen
Trainer (uncredited)
Milt Bronson
Ring Announcer (uncredited)
Ralph Brooks
Man at Bar (uncredited)
Steve Carruthers
Reporter (uncredited)
Tom Coleman
Dugan Detective School Graduate (uncredited)
