Jonathan Haze

as Seymour Krelboined

Jackie Joseph

as Audrey Fulquard

Mel Welles

as Gravis Mushnick

Dick Miller

as Burson Fouch

Myrtle Vail

as Winifred Krelboined

Karyn Kupcinet

as Shirley

Toby Michaels

as Teenage Girl

Wally Campo

as Det. Sgt. Joe Fink / Narrator

Jack Nicholson

as Wilbur Force

Leola Wendorff

as Siddie Shiva

Lynn Storey

as Mrs. Hortense Feuchtwanger

Jack Warford

as Det. Frank Stoolie

Meri Welles

as Leonora Clyde

John Herman Shaner

as Dr. Phoebus Farb

Dodie Drake

as Waitress

Charles B. Griffith

as Screaming Patient/ Audrey Junior (voice) / Burglar (uncredited)

Frank Mills

as Man in Crowd Outside Shop (uncredited)

Jack Griffin

as Drunk (uncredited)

Robert Coogan

as Tramp (uncredited)