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)