Tony Randall

Hercule Poirot

Anita Ekberg

Amanda Beatrice Cross

Robert Morley

Captain Hastings

Maurice Denham

Inspector Japp

Guy Rolfe

Dr. Duncan Doncaster

James Villiers

Franklin

Julian Glover

Don Fortune

Clive Morton

Mister X

Cyril Luckham

Sir Carmichael Clarke

Richard Wattis

Wolf

David Lodge

Sergeant

Patrick Newell

Cracknell

Austin Trevor

Judson

Alison Seebohm

Miss Sparks

Windsor Davies

Dragbot

Sheila Reid

Mrs. Fortune

Drewe Henley

Bowling Alley Attendant (uncredited)

Margaret Rutherford

Miss Jane Marple (uncredited)

Stringer Davis

Mr. Stringer (uncredited)

Roger Avon

Detective Sergeant (uncredited)

John Bennett

Waiter (uncredited)

Roy Lansford

Man on Airport Escalator (uncredited)

Emile Stemmler

Waiter (uncredited)