Alvin tries to sell his latest invention with the help of Max. Wendy Chong attempts to recruit Howie as a partner in science.
The family is surprised when Alvin suddenly has a girlfriend, but quickly grow fond of her. Max however smells a rat and stands up for his best bud when he thinks this new love is just using Alvin for student government gain. Howie is testing the intelligence of a pig, but runs into trouble when the Ackermans keep treating it like a pet.
After Alvin claims not to have any fears, Max, Howie and Juliet set out to scare him. But with Diane and Abby away at a college interview, Lloyd is left in charge and does not know how to handle a potential ghost in the house.
Alvin and Juliet have been dating for a while and Juliet wants their parents to meet. But what seems like a harmless idea quickly escalates into the parents forbidding Alvin and Juliet from seeing each other anymore! At the same time, Max and Abby discover Howie has been keeping an amazing snow fort secret from them.