The S.S. Pee Pee Pants is the lemur kingdom's only ship, which was first introduced as Old Porcelainsides in the episode Poll Position. The ship was soon destroyed during the Butterfly War after the first butterfly attack.
The boat was launched by King Julien with the name Old Porcelainsides during the episode Poll Position, after thinking that his kingdom needs a royal navy. During the launching, Willie was announced as the captain of the ship, before it starts to sink later in the episode. The ship made its third appearance in the episode Gimmie Gimmie Gimmie: The Game, and was referred to as the S.S. Pee Pee Pants by Xixi. It was then used for fighting against the pirates in the episode O Captain My Captain Pt. 2 by Clover and Mort, before it sank in the episode The Butterfly War after the first butterfly attack.
The ship however was presumably recovered, as it was seen multiple times in various episodes of Season 4 and Season 5.