Victor Buono

Character: Leo Kroll

David McLean

Character: Lt. Frank Benson

Diane Sayer

Character: Barbara Wells

Davey Davison

Character: Tally Raymond

Baynes Barron

Character: Sgt. Mack Clyde

Ellen Corby

Character: Mrs. Kroll

Russ Bender

Character: Dr. Clarence Sanford

Jeanne Bates

Character: Clara Thomas

Mimi Dillard

Character: Thelma

Selette Cole

Character: Helen Lawson

Michael Ryan

Character: Detective Mel Posner

Wally Campo

Character: Eggerton

Byron Morrow

Character: Dr. Morton

John Yates

Character: Intern

James B. Sikking

Character: Police Sketch Artist

Robert Cranford

Character: Jack Rosten

Fred Aldrich

Character: Apartment House Manager (uncredited)

Benjie Bancroft

Character: Police Officer (uncredited)

Fred Fisher

Character: Detective (uncredited)

Kenner G. Kemp

Character: Detective (uncredited)

Victor Masi

Character: Attendant (uncredited)