Needing to find a part time job in order to buy the latest video game, Alvin decides to "borrow" Brittany's baby-sitting job. But Basil, a sensitive little six year old boy, is not too thrilled at having Alvin look after him. So he decides to put Alvin through the wringer!

When Dave comes down with a bad cold, Alvin quickly offers to take over Dad duty. But he quickly learns that parenting is a lot harder than he ever imagined.