On screen
Cast
23 credited performers
Todd Armstrong
Jason
Nancy Kovack
Medea
Gary Raymond
Acastus
Laurence Naismith
Argos
Niall MacGinnis
Zeus
Michael Gwynn
Hermes
Douglas Wilmer
Pelias
Jack Gwillim
Aeëtes
Honor Blackman
Hera
John Cairney
Hylas
Patrick Troughton
Phineas
Andrew Faulds
Phalerus
Nigel Green
Hercules
John Crawford
Polydeuces (uncredited)
Artwork unavailable
Ferdinando Poggi
Castor of Sparta (uncredited)
Ennio Antonelli
Dmitrius, Drummer on Argo (uncredited)
Artwork unavailable
Harold Bradley
Guard in Palace (uncredited)
Artwork unavailable
Aldo Cristiani
Lynceus (uncredited)
Artwork unavailable
Eva Haddon
Medea (voice) (uncredited)
Artwork unavailable
Doug Robinson
Eupaemus (uncredited)
Artwork unavailable
Davina Taylor
Briseis (uncredited)
Tim Turner
Jason (voice) (uncredited)
Artwork unavailable
Bill Gudgeon
Triton (uncredited)