Cast from Penguin Pool Murder

Edna May Oliver

Miss Hildegarde Martha Withers

Robert Armstrong

Barry Costello

James Gleason

Police Inspector Oscar Piper

Mae Clarke

Gwen Parker

Donald Cook

Philip Seymour

Edgar Kennedy

Officer Donovan

Clarence Wilson

Bertrand B. Hemingway

James Donlan

Security Guard Fink

Gustav von Seyffertitz

Von Donnen / Dr. Max Bloom

William Le Maire

MacDonald

Joe Hermano

Chicago Lew

Guy Usher

Parker

Rochelle Hudson

Telephone Operator

Wilfrid North

Judge

Sidney Miller

Student with Glasses Isadore Marks (uncredited)

A.S. Byron

Jailer Strauss (uncredited)

Edith Fellows

Little Girl at Aquarium (uncredited)

Chuck Hamilton

Jack, Policeman (uncredited)

Mary Mason

Parker's Secretary (uncredited)

Dorothy Vernon

Purse Snatching Victim at Aquarium (uncredited)