Leo Gorcey as Terence Aloysius 'Slip' Mahoney

Huntz Hall as Horace Debussy 'Sach' Jones

Lloyd Corrigan as Edgar Alden Franklin Smith

Lela Bliss as Margo

Philip Van Zandt as Dr. Basil Granville

Bernard Gorcey as Louie

William Benedict as Whitey

Buddy Gorman as Butch

David Gorcey as Chuck

Jan Kayne as Cynthia

Argentina Brunetti as Mrs. Parelli

Marshall Bradford as Professor Krantz

Robert Coogan as Jack Eagan

Michael Ross as Gus

Bess Flowers as Seance Guest (uncredited)