Ernie's new playmate, Mike, likes to pull childish pranks that upset the Douglas family. Robbie goes to talk to Mike's parents only to learn that Mike doesn't have a mother, and that Mike is actually a girl named Michelle! Unfortunately, Michelle's father treats her like his son rather than his daughter, only talking about sports and other "boy" things, so the Douglases try to bring out her feminine side.
—S Sather