Harry Hamlin as Perseus

Judi Bowker as Andromeda

Burgess Meredith as Ammon

Maggie Smith as Thetis

Ursula Andress as Aphrodite

Claire Bloom as Hera

Siân Phillips as Cassiopeia

Flora Robson as A Stygian Witch

Laurence Olivier as Zeus

Tim Pigott-Smith as Thallo

Neil McCarthy as Calibos

Susan Fleetwood as Athena

Anna Manahan as A Stygian Witch

Freda Jackson as A Stygian Witch

Jack Gwillim as Poseidon

Pat Roach as Hephaestus

Donald Houston as Acrisius

Vida Taylor as Danae

Harry Jones as Huntsman

Ferdinando Poggi as Guard Killed by Scorpion (uncredited)

Barrie Holland as Peasant (uncredited)