Pete tries to break up with his girlfriend Melissa but things do not go as planned.
When Pete is on his way to hold a presentation in front of the museum board he accidentally gets an overdose of some allergy medicine Berg is testing out which causes his presentation not to go as good as he had hoped.
Sharon has a new boyfriend, Ted, and he is taking up too much of her time according to Pete and Berg, so they try and break Sharon and Ted up.
When Pete, Berg, Sharon and Melissa goes to a Celtic game Berg gets to sit on the bench with the team which makes Pete very jealous because he is the biggest Celtic fan of them all. Berg tries to make it up but in the process he does something he will regret.
When Mrs. Wexler moves out of the building Pete, Berg and Sharon lives in Berg and Sharon decides to try and get a good tenant, so they change the contact number and interviews the applicants themselves while Pete tries to find a good anniversary present for Melissa.
Berg and Pete start a softball team in order to meet more women and Bill makes the mistake of thinking that the team is good and makes a bet with a rival pizza place.
After Pete's breakup with Melissa Berg is trying to get Pete to forget about her so he sets Pete up with a patient. Pete really likes this girl but then Berg discovers that she may not have long to live.
Berg decides to throw a party so he can see a girl called Bethany, but the timing couldn't be more wrong as Pete has to prepare for a speech.
Berg and Sharon set Pete up with a girl they find listed in the personal ads but it turns out the girl is a bit overprotective.
Berg wonders why Pete always wants to deliver the pizza to 845 Arlington, so Berg makes the delivery for a change and discovers that it's a gorgeous artist who paints with her body that's been making the orders.
Pete and Berg thinks back to to their old college days and how they and Sharon met because Bill asked why neither Berg or Pete ever dated Sharon.
Berg's father is visiting, and during his visit Pete accidentally finds out that Mr. Bergen has quit his job, and Mr. Bergen makes Pete promise not to tell Berg about it and that is not the only thing Pete has to lie about, Berg has not told his father that he quit law school which Pete has promised not to tell Mr. Bergen, and it turns out Pete is not good at keeping secrets.
Pete and Berg tries to do something when their landlord goes over the edge when it comes to the rules, which is not as easy as it seems.
When Berg suddenly isn't number one in every test anymore he tries to find out who it is. Turns out the one who is better then Berg is a woman named Ashley, so Berg then tries to do something so that he will be number one again
Sharon has decided to quit her job but when she tells her boss he convinces her to think the decision over in Aruba, but on the way there problem after problem arises.
Pete has a new girlfriend and refuses to tell Berg and Sharon who it is. When Berg and Sharon finally finds out who it is, Berg recognizes her and quite quickly remembers where he has seen her before.
It's homecoming and Pete and Berg are trying to impress two of their old friends by getting two luxury box seats at the game, which proves not to be that easy 18 minutes before the game. In the mean while Sharon and Johnny are having a little arguement because as it turns out they both have lied about what the other does for a living.
Pete makes a big mistake when he trusts Berg with his elective course papers, instead of metallurgy Berg chooses sports broadcasting for Pete, and surprisingly Pete likes it.
Berg goes mad and murders several people.
Berg talks to Ashley and she agrees to talk her father into giving Pete an Internship at his firm, Ashley agrees when Berg promises to switch shift at the hospital so Ashley doesn't have to see him.
One of Pete's ex-girlfriends is getting married and Pete, Berg and Sharon are invited to the wedding, Sharon is even a bridesmaid and Berg asks Ashely to be his date.
Ashley goes to visit her boyfriend at Oxford and when Berg finds out he goes all the way to England only to find out the boyfriend actually studies in Oxford, Mississippi.
Sharon and Johnnys plans to have a quiet thanksgiving just the two of them gets changed when Berg invites Ashley and her boyfriend, Justin, and Pete's gradfather also gets invited because he has left his wife again and is staying at Pete's and Berg's over thanksgiving. During thanksgiving dinner Berg tries to break Justin and Ashley up.
Sharon gets very upset and starts a big fight when she discovers that Johnny's friend Shawn, is a woman. Berg and Ashley are also having some problems so when Pete is going to be Adam Carolla's chauffeur for a couple of days he makes Johnny, Sharon, Berg and Ashley go on a drive with Adam and Pete hopes that Adam can solve their problems because he does it for a living.
Sharon is in charge of her company's Christmas party but she is having trouble organizing it. Pete starts dating an older woman which really isn't his style, because the woman even has a 10-year-old son. Berg is having some problems with a difficult patient who doesn't seem to like him.
Michaels mother has to work a lot for a week so Kaitlyn asks Pete to watch him after school, it all goes well until Pete gets an emergency that he needs to attend to so he has to ask Berg to watch Michael, Berg then takes Michael to the dog track to make him learn some math, Pete of course is very angry when he finds out. After a lot of hesitation Sharon asks Johnny to move in with her.
Sharon accidentally finds an old ad Berg was in, and it was for underwear, so of course Sharon has to make fun of Berg because of that. Sharon makes up a competition at the pizza place to come up with a great comment for the ad, and the winner gets a free pizza. Now Berg goes on a hunt to find a ugly picture of Sharon from the tenth grade. Pete asks Kaitlyn to marry him.
Sharon has applied for a new job but the company discovered something shocking when they did their routine background check. Sharon blames Pete and Berg for this and gets really mad.
Sharon is a bit jealous every time Shawn and Johnny hang out, so she sets up Shawn with Berg, which has consequences. In the mean while Pete gets a new friend, Irene.
A big storm is coming to Boston and Berg is a bit depressed about Ashley, but he is also interested in a weather woman thats on Spanish television, so when she is out to do a report in the middle of the storm Berg decides to go out in the storm just to ask her out.
Berg has a big decision to make because he has a date with Venita and just after she agreed to go on a date with him Ashley shows up and tells Berg she broke up with Justin. He finally decides to go with Venita and dump Ashley but she goes a little nuts and starts following Berg around.
Berg has given Ashley a key to the apartment without discussing it with Pete, so naturally Pete gets upset and then goes upstairs and manages to get Sharon and Johnny in a fight too. While thats happening Berg starts helping a boxer called Buster.
Johnny's sisters are in town for mothers day and all of them are pregnant, which makes Sharon a bit irritated because she does not think she would be a good mother. Ashely is very interested in a professor, so much that Berg actually starts suspecting she is posing nude for the professor.
Pete is tired of his job at the pizza place so he quits, he tries out psychiatry for a while but it does not really work out for him so then he takes his career counselors job because he gets his own career counselor a better job. Ashely and Sharon becomes friends, but all they talk about is Berg, which he doesn't really like.
Johnny is planing on proposing to Sharon and when he tells Berg and Pete, Pete feels like he should tell Sharon about his feelings for her.
Sharon is acting like Johnny never even asked her to marry him and Pete feels bad and goes to Paris.
Pete comes back from France, and not alone, with him he has Colette, the girl who almost ran him over in Paris. Berg realizes he is not so young anymore when a young guy called Germ starts working at the pizza place and calls him sir.
Berg and Ashley's residency i starting and Berg switches over to Ashely's group and the doctor there seems to have something against him. Ashley has convinced Pete that Johnny wants to hurt him.
Pete tries to get Sharon a new job and Sharon makes the mistake to quit her current job before even knowing if she has gotten the new one. In the mean while Ashley's ex-husband tells Berg that Ashely used to beat him, so of course Berg gets a bit nervous around Ashely.
Pete wants to do something nice for everyone so he invites them to a football game, but the whole day turns into a big argument as Sharon and Johnny starts arguing about the wedding and Berg and Sharon starts arguing too while Pete has a little problem with Irene.
Johnny has found a really scary room in the basement of their apartment building and they decides to have their haunted house down there, but what they do not know is that when they entered the room they woke up a crazy scientist who switches Pete's brain with Ashley's brain and Berg's brain with Sharon's brain.
Ashley has to bribe Pete so that she can move in and in the mean while Sharon and Johnny has to beat another couple to get an opening date for their wedding.
Berg wants to spice up his relationship with Ashley so he takes her to his parents house for the weekend. Sharon complains that her sex life is not that exciting so Pete shows Johnny the Kama Sutra book.
Sharon and Ashley actually hangs out in Berg's apartment and they get very drunk and while Sharon is drunk she asks Ashley to be in her wedding, which she really regrets when she sobers up. Berg, Johnny and Pete goes to a laundromat with a bar and while they are there Berg gets his clothes stolen, Pete tries to get a date with a woman there and Johnny is trying to get Pete to use fake quarters.
It's thanksgiving and Ashley invites a hobo for dinner to get back at Berg, the dinner turns into a big argument because the hobo tells a lot of lies about them.
Pete's grandfather is back and has as usual left his wife, this time Berg manages to get some tests to see how he is doing and the results are not good. Johnny keeps running into Ashley in the apartment when she is getting undressed.
Sharon and Johnny are moving to the basement because they can't afford to lite in their current apartment as none of them has a job. Irene accepted a package for Pete because he wasn't home and now Pete is trying to get someone to get it back for him because he is afraid of Irene, and in the mean while Ashley is going to rent Sharon's and Johnny's old apartment.
Ashley is planning to have a New Years Eve party and when Berg happens to treat Robert Goulet at the hospital he convinces him to sing at Ashely's party. Sharon is having a quiet New Years Eve for her and Johnny but when he finds out that Robert Goulet is coming to Ashley's party he really wants to go there.
Johnny persuades Sharon to buy her wedding dress on a sale and takes Pete and Berg with her as Pete also tries to find a girl he slept with last night. While that is happening Ashely tries to fix her garbage disposal but her clock gets stuck in it.
Johnny and Sharon accidentally finds a secret room in their apartment and there is a lot of monitors in which they can see every apartment, and of course they use them. Pete tries to find out who is making a lot of his stuff disappear.
Ashley has a new boyfriend, and it's not just anyone, it's a baseball superstar named Nomar Garciaparra. Sharon is organizing a bachelor auction where the money goes to charity and Ashely has gotten Nomar to participate so of course Berg, who is a bit jealous now that Ashley has a boyfriend, also has to participate in the auction.
Berg is having a difficult time at the hospital because everyone is teasing him about what happened at the charity auction and he is trying to take on as many shifts as possible so they will forget about it, but he learns that that can have consequences too. Pete wants to have a more meaningful job, so he starts as a volunteer fireman. Sharon continues to try and help people, this time by reading to children at the hospital.
Ashley somehow gets Pete to be her caddy, but on their way there, in the subway, they get mugged. Berg is still having some troubles at the hospital, he is afraid he will make a mistake again when he has to fill in for a doctor who is sick. Sharon and Johnny are writing their own wedding vows, but Pete and Berg manages to get Sharon to think that Johnny is very bad at writing stuff like that so she tries to get her hands on his vows.
Pete forgets his make-up bag at the fire station and his workmates finds it, when Pete comes to get it the fire chief asks Pete to give his daughter a makeover. Berg, who is on probation, is doing everything he can to get the probation removed, so he lets a superior at the hospital use his apartment for a while so she can get some sleep. Sharon is hosting a tea party for some people from the hospital.
Pete, Berg and Johnny tell each other stories about women on the steps to their apartment building.
Berg is annoyed because Sharon has been spending less and less time with him and Pete so he gets her to agree to hang out with him at O'Malley's at the same time as Johnny is having his bachelor party, but things doesn't turn out as Berg wanted. Pete's co-workers gets Pete to think that Marti is interested in him.
Berg happens to meet Marti at the hospital and asks her out on a date and when Pete finds out he of course gets really mad. Germ noticed that someone had stolen some toilet paper and suspects that it was Ashley who took it. Shawn is back in town and she is pregnant but the father is nowhere to be found so Johnny says he can be her Lamaze partner, and of course Sharon gets jealous.
Berg has been depressed lately so he decides to go visit his parents. Pete is upset when Marti went into fireman boot camp before him. Sharon and Johnny finally decides to get a joint checking account which is a very big deal for both of them.
Sharon and Johnny are fighting and the wedding is close so Sharon cancels some of the plans, but then they decide they really want to get married so Irene arranges the wedding on the roof of their apartment building.
Pete is attacked by a bear and gets really upset when Marti doesn't rush home to see him when he gets back from the hospital. Ashley is very angry with Pete because Nomar broke up with her because Pete told a joke that Nomar actually believed. Berg and Irene doesn't want anyone knowing what they did after the wedding so they try and destroy all evidence of it.
Ashley is trying to prove that she doesn't need anyone, as Nomar wants to get back with her but she apparently does not want to, so she hangs out with Germ. Berg and Irene can't keep their hands off each other, but still try and keep everything a secret although Berg feels like he is almost treating Irene like meat.
Johnny tells Berg that he saw him and Irene in his house and that he must tell Sharon, but Berg gets Johnny to promise not to tell her, it doesn't take long until Sharon gets Berg to tell her what Johnny is hiding though, but it does not stop there as Sharon acts like she does not know the secret and tries to get Johnny to tell her it. Ashley gets an angry mob after herself when she is the cause why Nomar is leaving his current team.
Pete, Berg and Sharon are watching scary movies, Irene knocks on the door to say hello to Pete and when she sees what they are watching she says she wants to join them, but Pete says no, so Irene puts a curse on them.
Pete, Berg and Johnny are sitting in the kitchen playing cards, but the feel like they should be out in clubs and picking up women all night long, so they actually decide to go to a club, but when they get there they realize that it's not that easy to get into the club. When Sharon finds out that Johnny didn't have his wedding ring on when he went to a club she goes nuts and drags Ashley with her and goes looking for him.
Johnny is working on the new house, but he is extremely slow so of course Sharon is complaining, it gets to the point that Sharon hires a carpenter. Marti and Pete are having troubles.
Berg and Irene wants to see if there could me something more between them, if they could be an actual couple, not just sex buddies. Their plans change when Irene decides to ask Pete out to dinner instead of Berg. Sharon and Ashley spend a lot of time with each other, which makes Johnny quite annoyed.
Some pipes are broken in Ashley's apartment and there is so much water leaking that it comes down in Pete's and Berg's apartment, because of that Berg goes down to Sharon and Johnny's apartment to catch some sleep because he needs to get back to the hospital soon, and while Berg is in their apartment Johnny gets some doubts about having a baby. Pete tries to get some sleep at Irene, but of course she takes it the wrong way and think that Pete likes her.
Pete sees a beautiful woman on the subway but he doesn't make it onto the subway train, so he tries to locate her. Johnny is doing some plumbing in Ashley's apartment which also has an impact on Berg as he was showering but Johnny turned off the water for the whole building, so now he has shampoo in his hair but no way to get it out. A dog gets really interested in Sharon and follows her home where she has the dog to lick all the dishes, but in the process the dog also eats her wedding ring.
When Pete, Sharon, Beg and Johnny are at a restaurant Sharon saves an old mans life, while Pete and Berg just watched, they are of course irritated that she saved him when they both are trained to save lives. So they then try and save someones life.
Johnny has finally finished one room in his and Sharon's new house, but things takes a turn for the worst when the house burns down. Berg's mother is visiting because she has just got divorced.
Ashley wants Johnny and Sharon to buy some shares with the money they got from the insurance. Pete and Berg's mother starts dating behind Berg's back.
Irene arranges a party and she finally wants to tell Pete about her and Berg and Berg's mother wants to tell Berg about her and Pete. Meanwhile Johnny bought Ashley a gift to thank her for the stock tip but Sharon sees the gift and assumes it is for her.
Pete and Berg are not talking after Berg found out that Pete and his mother were dating behind his back. Sharon is trying to figure out what she wants to do with her life.
Pete is trying to get Berg on a better mood because Berg is still mad at Pete after he slept with Berg's mother, and while Pete is cutting some carrots into pieces he cuts the tip of his finger off, so Berg takes him to the hospital. Meanwhile Sharon is trying to get a job at a law firm.
Ashley discovers that all babies are afraid of her and starts crying as soon as she is near. Sharon gets Johnny a special birthday present, a card which makes him an honorary fireman for one day, and he gets to go down to the firehouse.
Berg has realized that he is in love with Irene so he says I love you to her, but the problem is she did not say it back which makes Berg think that she might have lost interest in him which then leads to him going to a comic book signing where he meats someone who went to the same college as him and apparently had a big crush on him.
Sharon suspects that Johnny is cheating on her as he has been lying about where he has been the last few nights. Berg is having doubts about his relationship with Irene so he hangs out a bit with Katie.
Pete nearly get run over by a firetruck and the last thing he saw was Ashley, so of course he thinks that he is meant to be with her. Berg have another talk with Katie but discovers something shocking about her.
Ashley needs a date for a hospital party so that she can impress the doctors so she will get a residency she really wants, she asks Pete to go with her and he agrees. Berg is trying to get Irene back so he invites her to a party for the doctors, the same party Ashley and Pete is going to. It's Sharon and Johnny's anniversary but they can't celebrate it because Johnny has to work at the fire station so Sharon surprises him by coming there to celebrate it anyways.
Pete is trying to convince Ashley to stay and not move to California. Berg is still trying to get Irene back, but she has a new boyfriend Roger.
Both Sharon and Ashley are late, so they both decide to take a pregnancy test. Berg is worried that he got Irene pregnant because according to the news some of the condoms he used were defective.