Sarah interrupts the latest scam to tell Ed she's going to a ballet lesson-- and he has to take care of Jimmy. Jimmy's not any more enthusiastic about the idea than the Eds are-- now everyone's day is ruined. The Eds, not wanting to invoke Sarah's wrath, are forced to watch Jimmy. They decide to play a harmless game of dodge ball. Ed and Edd help Jimmy knock Eddy out, and Jimmy decides the Eds aren't so bad after all. Jimmy and Ed start playing together, and Jimmy begins to copy Ed's behavior. Eddy decides that he'll turn Jimmy into the fourth Ed, and starts teaching him all the ways of scamming, conning, and being generally rude. Jimmy puts together a fantastic scam, but refuses to give the Eds and money from it. Sarah returns, and Jimmy pretends that he had been abused all day. Eddy created a monster.