Simon is surprisingly successful with pa's suggestion to show how mind-games can convince people of crazy ideas by pretending he's shrinking. When he's overheard, Matt turns the tables, only to be beaten in the end. Lucy invited to dinner classmate Shelby, curious about the rumors she suffers from bulimia. Eric lets Mrs. Bing drag him into meddling in a family affair on behalf of her friend Hinkle.

Simon's gentle schoolmate Stan sleeps over but has a horrid nightmare. Simon promises to keep his friend's secret but big brother Matt, who already suspected the boy's weird sister Karen 'Babydoll', spills the beans to dad, who informs the incredulous parents she's in a street gang. The girls fuzz about mall shopping, and Lucy's secretive romantic reason.