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Nick causes problems for Joel when his girlfriend Kate refuses to spend the night. Joel starts spending more time at her place and finds he'd rather be with his roommates. In the end, Joel moves back home and they all make compromises to get along. Andy starts working for SodaCo and his coworkers find him rather annoying. The entire office is forced to go through a series of seminars starting with "boundary training" because of him. He figures out that they can't fire him and continues to do all of the good-natured but annoying things that made everyone upset.

Nick goes to see the student health centre with paresthesia in his buttocks, where he is advised by the caveman doctor to exercise more. While there, he learns that his CRP is up but he his told not to worry. However, he does research on the internet and finds out it could be a sign of leukocytosis. worried, he pretends to be Joel and uses his insurance to see a HMO who tells him he has appendicitis and schedules him for an appendectomy. Meanwhile Joel and Kate are having relationship troubles, with Kate using far-fetched excuses not to sleep with Joel and avoiding him. Their relationship has lasted three months, which is when Kate traditionally dumps her boyfriends. Joel's boss finds out about the surgery for Nick when the insurance calls, but believes it to be for Joel and so gives him time off. When Kate comes to break it off with Joel, she learns of his major surgery and rushes to the hospital where Joel, disgusted that she only came when she thought he was having surgery breaks it off with her.

The boys are throwing a party because it is Long Night, a cavemen holiday that remembers when the cavemen did not die in the coldest day in history.

Andy participates in Nick's open mike night, and becomes famous for his character of a dumb caveman.

Neighbors who adopt a cave kid ask Joel, Nick and Andy to be his mentor.

Joel runs into trouble when he parks in an executive's parking space. Nick competes with Maurice for the attention of his ex-girlfriend, Heather, after Maurice explains his own charm with women in terms of hunter and gatherer roles, classifying himself as a hunter and Nick as a gatherer.