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)