Thetis (Clash of the Titans)

Thetis is Calibos's mother, one of the Nereids and is the main antagonist of the 1981 version of Clash of the Titans. Her son Calibos who was engaged to Princess Andromeda is turned into a monstrous satyr by Zeus after he killed nearly all of Zeus's flying horses (except Pegasus) and is exiled. Angered at this, Thetis says if Calibos can't marry Andromeda, no man can and decides to take her revenge on Zeus's son Perseus.