Terence Aloysius 'Slip' Mahoney
Leo Gorcey
Horace Debussy 'Sach' Jones
Huntz Hall
Mrs. Parelli
Argentina Brunetti
Professor Krantz
Marshall Bradford
Jack Eagan
Robert Coogan
Gus
Michael Ross
Seance Guest (uncredited)
Bess Flowers
Edgar Alden Franklin Smith
Lloyd Corrigan
Margo
Lela Bliss
Dr. Basil Granville
Philip Van Zandt
Louie
Bernard Gorcey
Whitey
William Benedict
Butch
Buddy Gorman
Chuck
David Gorcey
Cynthia
Jan Kayne
Director
William Beaudine
Assistant Director
Wesley Barry
Music Director
Edward J. Kay
Dialogue
Bert Lawrence
Director of Photography
Marcel Le Picard
Continuity
Mary Chaffee
Producer
Jan Grippo
Editor
William Austin
Sound
Tom Lambert
Art Direction
Dave Milton
Set Decoration
Raymond Boltz Jr.
Production Manager
Allen K. Wood
Additional Dialogue
Screenplay
Charles R. Marion