Lucy and Mary Jane are attending auto-repair classes, and Lucy is dating the professor. Uncle Harry buys an antique car and is going to enter it in a classic car show. Unfortunately, it needs work, and Uncle Harry goes out of town for the weekend, and relies on Lucy to call the repairman and keep it at her house. But she forgets to call, so Lucy and Mary Jane decide to repair the car themselves, but they end up destroying it. (thetvdb.com)