In the Season 3 episode "Mermaid Man and Barnacle Boy IV," SpongeBob accidentally triggers widespread chaos in Bikini Bottom after discovering and playing with a superhero's utility belt. The situation escalates when he shrinks Squidward and eventually the entire city's population using the "Small Ray," necessitating a creative solution. You can watch the full episode on Encyclopedia SpongeBobia or IMDb . Mermaidman and Barnacleboy IV/Doing Time - IMDb