Harry Hamlin
Perseus
Judi Bowker
Andromeda
Burgess Meredith
Ammon
Maggie Smith
Thetis
Ursula Andress
Aphrodite
Claire Bloom
Hera
Siân Phillips
Cassiopeia
Flora Robson
A Stygian Witch
Laurence Olivier
Zeus
Tim Pigott-Smith
Thallo
Neil McCarthy
Calibos
Susan Fleetwood
Athena
Anna Manahan
A Stygian Witch
Freda Jackson
A Stygian Witch
Jack Gwillim
Poseidon
Pat Roach
Hephaestus
Donald Houston
Acrisius
Vida Taylor
Danae
Harry Jones
Huntsman
Ferdinando Poggi
Guard Killed by Scorpion (uncredited)