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