That Sinking Feeling

S1, E6: Ganon has a new toy: an Overworld Magnet, capable of pulling any object in the Overworld down into the Underworld. And the first thing he uses it on us King Harkinnian's castle! Now Ganon has captured the King and Sprite, and is holding the whole castle in one of his underground chambers. Link and Zelda must use the Triforce's magic to fight their way into the Underworld, defeat Ganon, and return King and castle to the Overworld where they belong!