Kenneth Branagh Hercule Poirot Director, Actor, Producer Gal Gadot Linnet Ridgeway Doyle Actor Armie Hammer Simon Doyle Actor Emma Mackey Jacqueline de Bellefort Actor Annette Bening Euphemia Actor Tom Bateman Bouc Actor Ali Fazal Andrew Katchadourian Actor Russell Brand Dr. Bessner Actor Sophie Okonedo Salome Otterbourne Actor Letitia Wright Rosalie Otterbourne Actor Dawn French Mrs. Bowers Actor Jennifer Saunders Marie Van Schuyler Actor Rose Leslie Louise Bourget Actor Michael Green Screenwriter Ridley Scott Producer Kevin J. Walsh Producer Judy Hofflund Producer Mark Gordon Executive Producer Simon Kinberg Executive Producer Matthew Jenkins Executive Producer James Prichard Executive Producer Mathew Prichard Executive Producer Haris Zambarloukos Cinematographer Úna Ní Dhonghaíle Film Editing Patrick Doyle Original Music Jim Clay Production Design Andrew Ackland-Snow Art Director Abi Groves Set Decoration Paco Delgado Costume Design Lucy Bevan Casting