Peter Ustinov as Hercule Poirot

Jean Stapleton as Ariadne Oliver

Constance Cummings as Amy Folliatt

Tim Pigott-Smith as Sir Stubbs

Jonathan Cecil as Hastings

Kenneth Cranham as Insp. Bland

Susan Wooldridge as Amanda Brewis

Christopher Guard as Alec Legge

Jeff Yagher as Eddie South

Nicollette Sheridan as Hattie Stubbs

Ralph Arliss as Michael Weyman

Caroline Langrishe as Sally Legge

Leslie Schofield as Mr Tucker

Marjorie Yates as Mrs Tucker

Pippa Hinchley as Marlene Tucker (uncredited)

Vicky Murdock as Marilyn Tucker

Jimmy Gardner as Old Merdell (uncredited)

Sandra Dickinson as Marilyn Gale

Jack Ellis as Policeman

James Gaddas as Young Foreign Man

Alan Parnaby as Boatman

Harry Fielder as Tombola Man (uncredited)