Feature-length episode of the Nickelodeon animated series. SpongeBob is in a predicament: after being entrusted by Mr Krabs to keep the Krabby Patty formula safe, SpongeBob is overcome with grief when he loses the recipe. He then enlists the help of the most unlikely companion, Plankton, who wants the secret Krabby Patty recipe for himself. With the help of his friends, SpongeBob must use Plankton's memory machine to retrace the happiest moments of his life and find the Krabby Patty formula in time for the Krusty Krab's eleventy-seventh anniversary.