The Legend of Zelda: Majora's Mask. Episode 1.

Once upon a time Link was riding through the forest minding his own buisness when a stranger known as Skullkid popped out of nowhere and stole his horse Epona along with the Ocarina of time. Link unwittingly chased Skull Kid into the world of Termina where he is soon cursed by the Skullkid. In his new form as a Deku Shrub Link follows the Skullkid deeper into the rabbit hole where he soon discovers the Creepy Mask salesman and Clocktown. Now the race is on to reacquire the Ocarina and save the inhabitants of Clocktown from the moon which is pummeling through the sky towards Termina! Along the way Link meets many new characters including the Bombers Gang, Astronomer and a list of other interesting locals. The adventure has only just begun!