Pete wants to break up with Melissa but has much trouble doing it, so she dumps him. Berg tries to reconcile them but just makes matters worse. Eventually, Pete and Melissa decide to work things out.
As Sharon faces an ethical dilemma with her company's latest insecticide, Berg continues to participate in drug trials. Pete makes a presentation of his architectural project, but Berg thinks he has ingested the latest drug being tested.
Berg tries to earn money by product-testing some talking sneakers. Meanwhile, Sharon's new boyfriend Ted is a lawyer; naturally, Berg and Pete must check him out--and they find him too perfect.
Pete is very eager to go to a Celtics game with Sharon and Melissa; Berg is not so keen to go. Despite this, Berg is in the lucky seat that gets him a seat on the bench, which upsets Pete. What can Berg do to make him happy again?
When Mrs. Wexler moves out of the apartment block, Sharon and the guys work out a way to vet the new occupant, but have different ideas about who it should be. To Pete's displeasure, Melissa moves in, which forces them to break up.
Sharon is dropped from her softball team. This inspires Berg to come up with the idea of starting their own women's team, sponsored by Beacon Street Pizza. Things do not go well when Pete's current infatuation, April, is a disaster.
Pete and Berg pick up two women, but Pete is only interested in a long-term relationship after breaking up with Melissa. Berg helps by fixing him up with a patient, but Berg hasn't yet learned how to read hospital charts properly.
Berg organizes a birthday party for Pete 7 months early so he can impress Bethany. He also tries to act cool, but it doesn't work as he finds it difficult to express his true feelings towards her.
Molly puts a personal ad in the paper wanting to meet Pete; he doesn't want to reply so Berg answers on his behalf. When the meeting goes well, Sharon decides to do the same thing. Molly turns out to be the very jealous type.
Berg delivers a pizza to Isabella, a delivery Pete usually makes. Berg discovers that she paints with her naked body, so he wants to date her. Meanwhile, Sharon tries to attract a jogger who runs past the apartments.
Berg's father lawyer father comes to town, but Berg hasn't told him that he he dropped out of law school--and his father also has a secret. Sharon has an unfortunate job at a fair advertising her chemical company, complete with protesters.
Pete installs a satellite dish on the building and his landlord removes it; Pete fights back but only succeeds in getting the building's heating turns off, which kills Berg's pet fish. The battle is on.