Medusa is a supporting antagonist in the novel Percy Jackson and the Olympians: The Lightning Thief, and its 2010 film adaptation of the same name. She is one of the three guardians of Persephone's Pearls, along with the Hydra and the Lotus Eaters.
Medusa is a lady who had an affair with posiden under Athena's statue thing and Athena cursed her to be the most ugly creature ever. Anyone who looks at her turns to stone.
