Cesar Romero

as Philip 'Phil' O'Dell

Bernadette O'Farrell

as Heather McMara

Lois Maxwell

as Margaret 'Peggy' Maybrick

Geoffrey Keen

as Christopher Hampden

Campbell Singer

as Inspector Rigby

Alastair Hunter

as Det. Sgt. Reilly

Mary Mackenzie

as Marilyn Durant

Lloyd Lamble

as Martin Sorrowby

Frank Birch

as Boswell - Airport Manager

Wensley Pithey

as Sid - Bartender

Reed De Rouen

as Connors

Peter Swanwick

as Smithers

Richard Johnson

as Danny McMara - Hit-and-Run Victim

Bill Fraser

as Sales Manager

Lisa Lee

as Donna Devore

Lionel Harris

as Allan Mellon

Betty Cooper

as Dr. Campbell - Asylum Superintendent

Clare James

as Miss Andrews - Asylum Receptionist

Katie Johnson

as Mad Mary - Old Inmate at Murder Scene

Jacques Cey

as Head Waiter

Jean Bayless

as Delmont Switchboard Operator (as Jean Bayliss)

Stuart Nichol

as Steve

Marguerite Brennan

as Desk Clerk at Heather's Apartment

Robert Adair

as John - Film Director

Terry Carney

as Minor Role (uncredited)

Robert Dorning

as Airline Reservations Clerk (uncredited)

Josephine Douglas

as Nurse at Glenhaven Sanatorium (uncredited)

Christina Forrest

as Minor Role (uncredited)

Jack Howarth

as Minor Role (uncredited)

Robert Moore

as Minor Role (uncredited)

Stuart Saunders

as Police Sergeant (uncredited)

Dorinda Stevens

as Girl at Film Studio (uncredited)

Hazel Sutton

as Minor Role (uncredited)

Larry Taylor

as Hospital Attendant (uncredited)

James Ure

as Airline Reservations Clerk (uncredited)