Jason
Todd Armstrong
Medea
Nancy Kovack
Phineas
Patrick Troughton
Phalerus
Andrew Faulds
Hercules
Nigel Green
Polydeuces (uncredited)
John Crawford
Castor of Sparta (uncredited)
Ferdinando Poggi
Dmitrius, Drummer on Argo (uncredited)
Ennio Antonelli
Guard in Palace (uncredited)
Harold Bradley
Lynceus (uncredited)
Aldo Cristiani
Medea (voice) (uncredited)
Eva Haddon
Eupaemus (uncredited)
Doug Robinson
Acastus
Gary Raymond
Briseis (uncredited)
Davina Taylor
Jason (voice) (uncredited)
Tim Turner
Argos
Laurence Naismith
Zeus
Niall MacGinnis
Hermes
Michael Gwynn
Pelias
Douglas Wilmer
King Aeetes
Jack Gwillim
Hera
Honor Blackman
Hylas
John Cairney
Unit Manager
Leonardo Scavino
Original Music Composer
Bernard Herrmann
Conductor
Stunts
Eddie Powell
Producer
Charles H. Schneer
Visual Effects
Ray Harryhausen
Associate Producer
Editor
Maurice Rootes
Screenplay
Jan Read
Beverley Cross
Poem
Apollonios Rhodios
Director of Photography
Wilkie Cooper
Director
Don Chaffey
Production Design
Geoffrey Drake
Jimmy Komisarjevsky
Camera Operator
Harry Gillam
Art Direction
Tony Sarzi-Braga
Production Executive
John Dark
Herbert Smith
Jack Maxsted
Paul Maslansky
Title Designer
James Wines
Sound Recordist
Cyril Collick
Assistant Director
Dennis Bertera
Sound Editor
Alfred Cox
Red Law
Continuity
Phyllis Crocker