
Cesar Romero
Philip 'Phil' O'Dell
Acting

Bernadette O'Farrell
Heather McMara
Acting

Lois Maxwell
Margaret 'Peggy' Maybrick
Acting

Geoffrey Keen
Christopher Hampden
Acting

Campbell Singer
Inspector Rigby
Acting

Alastair Hunter
Det. Sgt. Reilly
Acting

Mary Mackenzie
Marilyn Durant
Acting

Lloyd Lamble
Martin Sorrowby
Acting
![Frank Birch]()
Frank Birch
Boswell - Airport Manager
Acting

Wensley Pithey
Sid - Bartender
Acting
![Reed De Rouen]()
Reed De Rouen
Connors
Acting

Peter Swanwick
Smithers
Acting

Richard Johnson
Danny McMara - Hit-and-Run Victim
Acting

Bill Fraser
Sales Manager
Acting

Lisa Lee
Donna Devore
Acting
![Lionel Harris]()
Lionel Harris
Allan Mellon
Directing

Betty Cooper
Dr. Campbell - Asylum Superintendent
Acting
![Clare James]()
Clare James
Miss Andrews - Asylum Receptionist
Acting

Katie Johnson
Mad Mary - Old Inmate at Murder Scene
Acting

Jacques Cey
Head Waiter
Acting
![Jean Bayless]()
Jean Bayless
Delmont Switchboard Operator (as Jean Bayliss)
Acting
![Marguerite Brennan]()
Marguerite Brennan
Desk Clerk at Heather's Apartment
Acting

Robert Adair
John - Film Director
Acting
![Terry Carney]()
Terry Carney
Minor Role (uncredited)
Acting

Robert Dorning
Airline Reservations Clerk (uncredited)
Acting
![Josephine Douglas]()
Josephine Douglas
Nurse at Glenhaven Sanatorium (uncredited)
Production
![Christina Forrest]()
Christina Forrest
Minor Role (uncredited)
Acting
![Jack Howarth]()
Jack Howarth
Minor Role (uncredited)
Acting
![Robert Moore]()
Robert Moore
Minor Role (uncredited)
Acting
![Stuart Saunders]()
Stuart Saunders
Police Sergeant (uncredited)
Acting

Dorinda Stevens
Girl at Film Studio (uncredited)
Acting
![Hazel Sutton]()
Hazel Sutton
Minor Role (uncredited)
Acting
![Larry Taylor]()
Larry Taylor
Hospital Attendant (uncredited)
Acting
![James Ure]()
James Ure
Airline Reservations Clerk (uncredited)
Acting