Alvin convinces Theodore and Simon that she is evil. Simon says that although Helga is hard-nosed, Alvin cannot accuse her of being evil. Alvin proves his point by turning on the TV, which is showing a mystery movie which shows the babysitter as the culprit. Terrified, the boys run away, but Helga captures Theodore, soon catching Alvin and Simon as well. When Alvin and Simon are reunited with Theodore, he was not tortured as they thought, but had been helping Helga bake a cake. They learn that the babysitter is a trainee and is afraid she is going to fail her entry test. After these facts are learned, the boys help her so she can get her job, only with the agreement that she could be their babysitter for a while and they would get to stay up late.