Leo Gorcey

Terence Aloysius 'Slip' Mahoney

Huntz Hall

Horace Debussy 'Sach' Jones

Michael Ross

Gus

Lloyd Corrigan

Edgar Alden Franklin Smith

Lela Bliss

Margo

Philip Van Zandt

Dr. Basil Granville

Bernard Gorcey

Louie

David Gorcey

Chuck

William Benedict

Whitey

Jan Kayne

Cynthia

Robert Coogan

Jack Eagan

Buddy Gorman

Butch

Marshall Bradford

Professor Krantz

Argentina Brunetti

Mrs. Parelli

Bess Flowers

Seance Guest (uncredited)