In the SpongeBob SquarePants episode " Buried in Time " (often listed in season 7 or 8), SpongeBob, Patrick, and Squidward are trapped inside a buried time capsule containing a secret formula. While attempting to survive, they face antics while Plankton tries to steal the hidden formula. You can watch this episode on Paramount Plus and learn more on the Encyclopedia SpongeBobia Fandom page . Buried in Time | Encyclopedia SpongeBobia | Fandom