In the first part of this special one-hour season and series finale, Dharma and Greg find themselves once again trying to make peace between their polar opposite parents when an argument breaks out over whether the couple will vacation with the Finkelsteins or the Montgomerys. Dharma tries to appease both sides by arranging for everyone to spend the weekend at the Montgomerys' mountain chalet, but when the usual bickering and insults kick into high gear, it finally sends Dharma and Greg over the edge. Meanwhile, back at the office, Pete is left in charge of a routine SEC inspection, but when the agent turns out to be beautiful and female, he invents wild stories about inside trading... oh, just fast forward. (Part 1 of 2)
Charlie and Caitlin struggle to find security in their new relationship. To spite Charlie for downplaying an encounter with an ex, Caitlin accompanies one of New York's ten sexiest men on a business date to make Charlie jealous. Meanwhile, the Mayor plots a way to one-up his rival, the Mayor of Los Angeles.
Charlie and Caitlin are caught having sex on a surveillance camera in the Mayor's office and their secret affair is blown. Carter is finally granted a foster child, but is frustrated when he sees that Paul is better with the baby than he is - until the Mayor helps him tap into his paternal instincts.
Anya returns to Sunnydale, bent on vengeance on Xander for leaving her at the altar. She has reclaimed her vengeance demon abilities, but order to use them, she must get one of his frustratingly-forgiving friends to wish him harm.
Fez fantasizes about several musical numbers featuring himself and the rest of the gang while he gets ready for a school concert.
As a favor to Luke, Rory tutors Jess, but during their first study session, Jess convinces Rory to go on a quick outing with him.
Allegations against the Strike Team are front-page news, and the team is reassigned pending the investigation. Vic and Claudette find themselves following the trail of a deadly meth batch, while Shane and Dutch team up to investigate the unsolved murder of a widow's husband.
Clark gets into a class election and one of his opponents is a krypto-mutant who can control bees. Meanwhile a reporter from Metropolis visits to do a story on Lex.
Frasier returns to Boston to give a speech, and Niles, Daphne and Martin tag along to see the city. Once there, Frasier runs into Cliff Clavin.
The detectives investigate two crimes: the murder of a back-alley cosmetic surgeon and a violent rape; Clark finally takes Laughlin on in the boxing ring.
As Christmas approaches, Sharon goes on a shopping spree in New York while on tour with Ozzy and Jack. They learn that Michael, their security guard, has been arrested for robbing the house behind theirs. Michael denies any wrongdoing and insists that it was all a misunderstanding. He says he is filing a suit for wrongful arrest. The family, including Ozzy's eldest son Louis, gathers for the holidays. Christmas dinner features a number of arguments, but also several bright spots. Ozzy is very excited about the gravy he helped prepare. Jack receives a knife as a gift, but his parents want to take it away because they fear he will get into trouble with the law.
J.D. fears being contaminated with Hepatitis B, after a needle accidentally sticks his forearm. Meanwhile, Elliot has a hard time combining her new relationship and keeping up with studies. Turk obsesses about getting in shape, after Carla makes a fat joke about him.
Michael witnesses a fatal crash between a fighter jet and an alien vessel, and embarks on his own investigation leading to the recovery of an artifact. Meanwhile, Isabel spends the day with her mother, who's harboring a secret agenda and is working with her husband to discover Max & Isabel's secret, which leads to a shocking revelation.
Flex thinks that he and his boss Stacy are hitting it off, but what he doesen't know is that his best friend Duane has been secretly dating her. It's hard for them to hide it from Flex but when they both have to go on a buisness trip together Duane takes it to the extreme. Meanwhile that Flex is out of town Breanna and Spirit throw a party. Arnaz brings Natasha over and Breanna once again gets jealous. She tries to stop them but when their about to have sex all Arnaz can think about is Breanna. Also a boy named Lewis tries to get with Breanna. At the trip Duane can't take it and tries to stop Stacy and Flex from having sex only to reveal his relationship to Flex.
As his high school reunion approaches, Doug worries that Carrie's new hairdo will make her look like a librarian, rather than his usually sexy wife. Hoping to show Carrie off in front of his former classmates, Doug tries to find a way to tell her that he hates her bun without hurting her feelings. Meanwhile, Spence informs the guys that he's nervous about seeing one of his old teachers because he never called her back after the two shared an intimate encounter.
Dar faces his biggest test yet in his struggle to defeat the Lord of Darkness.
After her break-up with Aaron, Kim agrees to join Stevie in trying a speed-dating service. Meanwhile, Nikki works at Andell's club and catches Professor Oglevee on a date with another woman who turns out to be married. While on a date, Stevie frets over the fact that she doesn't act very feminine.
Joan engages in surprisingly risky behavior after she begins dating a younger man, Chris. However, her friends urge her to re-consider the relationship after she inadvertently takes ecstasy at a night club. Meanwhile, Toni hires William as her attorney and tries to monopolize all of his time with trivial matters.