The Legend of Zelda: Majora's Mask

After the events of The Legend of Zelda: Ocarina of Time, Link departs on his horse Epona in the Lost Woods and is assaulted by an imp named Skull Kid who dons a mysterious mask, accompanied by the fairies Tael and Tatl. Skull Kid turns Link into a small plant-like creature known as Deku Scrub and takes away his horse and his magical ocarina. Shortly afterward, Tatl joins Link and agrees to help him revert to his native form. A meeting with a wandering mask salesman reveals that the Skull Kid is wearing Majora's Mask, an ancient item used in hexing rituals, which calls forth a menacing moon hovering over the land of Termina. Link has exactly three days to find a way to prevent this from happening.