Perfect Storms (2013)

S4E14 Dunces and Dragons

Following a bizarre jousting mishap at a Medieval Times-themed eatery, SpongeBob and Patrick find themselves in a medieval rendition of Bikini Bottom. In this new world, they are wrongly identified as legendary knights and tasked by King Krabs with a mission to save his daughter, Princess Pearl, who has been captured by the sinister wizard Planktonamor.