Leo Gorcey

Terence Aloysius 'Slip' Mahoney

Huntz Hall

Horace Debussy 'Sach' Jones

Lloyd Corrigan

Edgar Alden Franklin Smith

Lela Bliss

Margo

Philip Van Zandt

Dr. Basil Granville

Bernard Gorcey

Louie

William Benedict

Whitey

Buddy Gorman

Butch

David Gorcey

Chuck

Jan Kayne

Cynthia

Argentina Brunetti

Mrs. Parelli

Marshall Bradford

Professor Krantz

Robert Coogan

Jack Eagan

Michael Ross

Gus

Bess Flowers

Seance Guest (uncredited)