In the Season 7 SpongeBob SquarePants episode " The Inside Job " (2009), Plankton accidentally lands inside SpongeBob's head while attempting to steal the formula, resulting in him being corrupted by SpongeBob’s conscience. The episode, directed by Luke Brookshier, Nate Cash, and Vincent Waller, sees Plankton navigating SpongeBob's mind and adopting his personality after taking control of his physical functions.
You can stream this episode on platforms like Paramount Plus and Amazon Prime Video . 129b. The Inside Job - Forums - SpongeBuddy Mania [S7E15] the inside job