Berta's granddaughter spends the day at Charlie's, which isn't a problem until he learns she's a beautiful, rebellious 16-year-old.

Charlie is stunned to learn his ex-girlfriend is now a man.

When Judith decides to take a vacation, the brothers have to take care of Jake during the week. Alan finds it challenging, and even forgets to pick up Jake from soccer practice. When Alan finds out that he has to go to the I.R.S. because they're auditing him, he forces Charlie to take care of Jake, and Charlie doesn't do any better then Alan.

After Chelsea discovers a nude picture of another woman on Charlie's cell phone, he blows off steam by going out for a night of drinking with Alan, Herb and his neighbor.

Evelyn demands Jake spend a night at her place when she finds out he spent Spring Break with Judith's parents. Neither Alan nor Charlie are keen on the idea, but going to a bar after dropping off Jake quickly erases their concerns.

Charlie and Mia start making their wedding arrangements. Things begin to fall apart when their two families meet each other. They eventually decide on a small ceremony in Las Vegas.

When Jake repeats one of Charlie's sexist remarks in front of Judith's support group, the women convince Judith to stop Jake's visits with his dad and Charlie.

Alan finds an opportunity to make money; Walden addresses his co-dependency issues.

Charlie starts to question his relationship with Chelsea when he hears that Mia is back in town. Meanwhile, Judith goes into labor and Charlie, Alan and Herb rush her to the hospital, on the sixth season finale.

Alan has trouble deciding if he should bring his younger girlfriend to Jake's birthday party to meet his mom and his ex-wife. Rose tries to get her boyfriend to act more like Charlie.

Charlie finds himself in an uncomfortable position when Jake takes off with the daughter of a former NFL player. Charlie's Mercedes proves a boon to Alan's love life.

Charlie unknowingly sleeps with an older man's trophy wife while Jake has to read a paper to his class.

Chelsea is asked by Alan to arrange a blind date between he and her new friend, unaware that her new friend is Rose.

Charlie takes a liking to Myra, the witty sister of Judith's fiancé, Herb.

After Charlie takes Alan to an eye doctor, they end up at cafe where they bump into Charlie's ex-girlfriend, Sherri. While there Alan shows an interest in Sherri, and decides to ask her out. The problem is that Alan can't get over Sherri's relationship with Charlie.

Judith is upset with Alan and Charlie when she learns that a surfer who uses Charlie's shower walks around half naked in front of Jake . Then Alan's worried when Judith and the surfer become friends.

Judith's devious siren sister stirs things up at Jake's 11th birthday party when she hits on Alan. Meanwhile, Evelyn brings alcohol and has a party of her own.

Charlie's friends and family put a crimp in his plan for a romantic Christmas Eve date. When Evelyn sees who the date is, she goes to great lengths to force a wedge between them.

CSIs investigate a death at Charlie's house.

Charlie has to come up with ways to keep his girlfriend's 4-year-old amused; Alan becomes a test subject.

Charlie is dating a woman whose personality and life are like his mother's.

Carefree jingle writer Charlie Harper has his lifestyle altered when his uptight brother and his 10-year-old nephew move in with him.

Charlie is invited to a party hosted by a gay ad-executive named Eric, so Charlie asks Alan to pretend that he's his life partner. While at the party, Charlie meets Eric's ex-wife Pamela, and tries to sleep with her without Eric finding out.

Charlie has to remove a half-naked woman from his bedroom before Chelsea arrives.

Alan starts to worry about a medical procedure that he is facing, and to get his mind off it, Charlie suggests they go to Las Vegas.

Charlie writes a children's song and finds success as Charlie Waffles. The children love him and the mothers seem to as well. Charlie's new found fame irritates Alan.

Jake gets suspended from school after drawing an offensive picture of a girl in his class that has large breasts. Meanwhile, Charlie is asked to watch over Alan's chiropractic office after pulling an all-nighter.

Charlie is perplexed when Frankie, the mysterious woman temporarily living in the Harper household, begins falling for Alan and not him.

Alan starts dating a woman with a Martha Stewart complex. Before long she's running the house with an obsession for perfection.

Chelsea wants Charlie to take dancing lessons for the wedding, when Charlie uncovers the truth that Chelsea has been lying about her finances.

After reconnecting with Kate, Walden becomes convinced she is the one for him -- until he meets a woman named Vivian.

Charlie is shocked when the handyman working on his house beats him out for Chloe's affections. Alan has no sympathy for Charlie's distress.

Charlie tries to get Jake's approval on a theme song that he is hired to write for a television show, which is based on a comic book that Jake is a fan. While Alan finds out more about Rose (including how smart she is), when he spends more time with her.

Alan looks forward to Judith's wedding, while Charlie and Myra continue their romance.

While overcoming a bad break-up, Chelsea invites her beautiful college roommate to stay at the house.

Walden and Alan are caught in the crossfire when Jake cheats on his girlfriend (Jaime Pressly) with her 18-year-old daughter.

Alan tries to win Kandi back. Meanwhile, Charlie starts to sleep with her mom, Mandi, and Judith gets set up with her father, Andy.

Charlie arranges a romantic date with Mia in the hopes of consummating their relationship. Alan begins to date Charlie's most recent ex-girlfriend.

After an earthquake hits, Judith's house is damaged and she needs a place to stay. So Alan decides to invite her to stay with him and Charlie, without getting Charlie's permission. Charlie isn't happy with this, but accepts it. Alan becomes jealous when Judith goes on a date, and asks Charlie to find him a date, so that he can show Judith that he dates as well.

Alan tricks Charlie into joining him and Judith in leading Jake and his classmates in the school's annual music show.

Charlie's desperate to make sure Chelsea and Evelyn don't befriend each other following their first meeting.

Alan meets a woman named Nancy at a grocery store, who fulfills every single one of his desires, forcing Charlie to take care of Jake. After knowing Nancy for a few days Alan decides to ask her to marry him, prompting Charlie to try and talk him out of it, and he even gets help from the brothers' mother.

Charlie fights his attraction for Teddy's daughter.

Charlie tricks Jake into taking ballet lessons, so he can get close to the teacher.

Charlie has a pregnancy scare involving one of his one-night stands and decides to go for the big "V," and we're not talking Vegas.

Charlie's still brooding over Alan's choice of their cousin as Jake's guardian if both parents die when the boy has an accident while in his care and has to be rushed to the hospital.

Charlie and Jake fight for the affections of a waitress, while Alan fights sexual tension with his receptionist.

Charlie borrowed money from Alan and on the day he is supposed to pay him back, Alan goes to ask Charlie for the money. He again finds Charlie in bed with a beautiful woman. After Charlie shoos him out and assures him he'll get the money for him later that day, the woman asks if Charlie is really out of cash and Charlie tells her not to worry, that he has plenty of hooker money.

Charlie can't function when his housekeeper storms off because of Alan's constant complaints, so Alan tries desperately to woo her back. Meanwhile, Rose comes to Charlie for dating advice.

Alan's advice to Chelsea that she get breast-reduction surgery is not met with enthusiasm by Charlie, who kicks him out, but staying with Evelyn has its own challenges.

Alan and Charlie are shocked when they wake up next to a strange woman, and try to find out what happened.

Strained relationships and girl-fighting result when a huge storm traps Walden, Alan, Zoey and Lyndsey in the house on Valentine's Day.

Realizing he's losing someone special, Charlie plans a Thanksgiving dinner to convince her he's a family guy and that she should be with him.

Alan finds out some surprising information about Judith's sex life when he decides to go on a date with one of her friends.

When Jake brings his 36-year-old girlfriend home for a visit, Alan is concerned; Walden tries to hide something from Alan.

While Charlie and Rose carry on their "affair," Alan's chiropractic business turns into a Ponzi scheme.

After getting unusually turned down at a bar, Charlie learns that a website has been made dedicated to exposing his lifestyle. Charlie sets out to find who created the site, making amends to all those he stood up, but it's harder than it looks when all the women take the apology better than expected.

Mia comes back to town with her dance troupe and invites Charlie to her performance. At first, he decides not to go and tries to convince Alan that he no longer has feelings for her. He goes to the see the performance and Mia explains that she wants some of Charlie's sperm. Charlie responds by asking Mia for something.

Ignoring Alan's warnings, Charlie continues to date Isabella until she threatens to put a curse on his manhood.

When Charlie discovers that Alan is sleepwalking, he believes it's related to his brother's lack of sex following his divorce, and comes up with a cure.

Charlie is miffed over Alan's planned attendance of Chelsea's birthday party and suffers the indignity of having Jake chauffer him around following a license suspension.

Charlie's new girlfriend Chelsea asks him to spend the night at her place, which puts Charlie well outside of his comfort zone, while Alan tries to enforce a punishment on Jake initiated by Judith for mooning a group of girls.

Evelyn's boyfriend, Teddy, invites Alan and Charlie to go with him to Las Vegas on his private jet. The boys confront their individual 'daddy issues'

Alan must face the consequences after revealing his identity to Larry.

Charlie has trouble keeping up with Mia's healthy lifestyle, so he begins to sneak beers, cigars, and burgers behind her back. When Mia finds out what he was doing, Charlie has to decide if he is truly in love with her or just whipped.

Alan finds out that Charlie stole his girlfriend and works on a plan to get back at Charlie, even though this happened when they were in high school.

A girl from Jake's school invites him to his first boy-girl party. Charlie and Alan help him get ready for it by giving him advice. Alan and Charlie get nostalgic and remember their first boy-girl party.

Jake's teacher has a meeting with Alan and Judith to discuss the lack of interest Jake has at school. Alan starts to fall for Francine, in a platonic way, because he is tired of the lack of intelligent communication he has with Kandi. Charlie helps Jake audition for his school musical.

Melissa doesn't think Alan's family appreciates him, so she asks him to move in with her and her mom.

Evelyn reads in the obituaries that her second husband, Harry has died. They all attend the funeral, including Jake who is excited at the opportunity of seeing a ""dead guy"". Charlie is excited by the opportunity of a newly single widow, and Alan is just happy to pay his respects to Harry.

Charlie is surprised to find out that Kandi has been living with them for the last three weeks. Alan is having a tough time helping Kandi earn a living. Charlie has lost his sense because of the dry-spell he is going through.

Despite warnings from Charlie, Jake continues to feed seagulls on the deck and the birds invade the house. Meanwhile, Charlie thinks Judith is taking advantage of Alan, who keeps going to her house to fix things.

Charlie invites a mysterious, slightly crazed woman to stay at the house until she can settle some family problems.

When Jake finds out that Alan has been dating Eldridge's mom, he packs up and heads to Judith and Herb's. Meanwhile, Charlie decides it's time to cut back on boozing.

When Charlie meets Angie's soon to be daughter-in-law, he realizes it's not for the first time.

Charlie plays a tricky game when he gets involved with Alan's divorce lawyer, who could make things difficult for Alan if she were, say, dumped by a self-centered lothario.

Charlie ends up in couples counseling.

Jake is taught the art of infidelity by Charlie, while Celeste is away for Christmas.

Alan and Charlie re-examine their sexual identities after Alan befriends Greg, a gay man. Meanwhile, Jake has a crush on Greg's daughter.

Charlie Harper is alive. Or is he?

Charlie Harper is alive. Or is he?

Alan and Jake meet Walden Schmidt, a broken-hearted billionaire.

Walden joins a group for adoptive fathers, and finds it to be a nice escape from Alan.

Alan and Walden go to Kate's fashion show in New York so Walden can reveal the truth about his identity.

Walden discovers how challenging it is to be intimate with women when his foster son, Louis, is in the house. Also, Herb asks Alan if he can go on a date with Lyndsey.

Alan breaks Walden's rules when he realizes that Louis thinks he's cool, and he wants it to stay that way.

Walden fears if he breaks up with Ms. McMartin, it will jeopardize his adoption of Louis. Also, Alan hesitates when Lyndsey asks him to move in with her.

Walden plans a big surprise for Zoey's birthday.

Walden deals with his ex-wife, Bridget.

Walden becomes a foster parent to a 6-year-old boy, but worries about himself when they don't hit it off like he hoped.

When Alan breaks up with their social worker to get back together with Lyndsey, Walden worries it will affect Louis’ adoption.

After they sign their divorce papers, Walden offers Alan the gift of his choice, but when Alan chooses something selfish and impractical, it puts his relationship with Lyndsey on the line.

Walden goes looking for Mrs. Right while Alan has an opportunity to reconcile with Lyndsey.

Walden's ex-business partner shows up at the beach house looking to make peace.

Alan prepares Walden for a date with Bridget, while Jake decides to emulate Walden and drop out of school.

Alan and Lyndsey decide to spice things up in the bedroom.

A birth mother considers having Walden and Alan adopt her baby.

Walden must choose between Zoey and Rose.

Alan and Walden attempt to convince Louis that Santa Claus is real.

When Walden runs into his ex and they start talking about getting back together, Alan worries that she is not good enough.

Alan has second thoughts about getting married after he's asked to sign a pre-nup.

After a health scare on Halloween, Walden decides he needs to change his life.

Marty Pepper proposes to Evelyn; Alan and Walden plan a bachelor party for Marty.

Depressed after his breakup from Courtney (Jenny McCarthy), Charlie goes to see his psychiatrist (Jane Lynch).

Walden and Zoey's relationship suffers after they share a near-death experience. Meanwhile, Alan wonders if Lyndsey has a drinking problem.

Alan takes it upon himself to help Walden keep Louis after the social worker discovers he and Walden are not really a gay couple.

Alan and Walden have a meeting with an adoption social worker that hinges on them being convincing as a loving couple. Lyndsey returns after 60 days in rehab.

Walden's mother arrives and Alan is smitten with her, even as she reveals a secret about Walden's past that sends him into a downward spiral.

Jenny moves in with Evelyn and her wealthy boyfriend, Marty.

When Walden gets tired of the complications that come with a traditional relationship, he hires an actress to be his girlfriend; Jake plans a rendezvous with Missi (Miley Cyrus) at the beach house.

Rose and Alan discover each other's secrets. Meanwhile, Charlie's desperate to get some time alone with Rose.

Charlie returns to his bachelor lifestyle after Alan moves out of the house. Alan suffers a breakdown after his divorce from Kandi.

Despite Alan's warnings, Walden starts dating Rose.

After a fight with Walden, Alan decides to move in with Herb.

Alan tries to hire his ex-wife's lawyer to help him win custody over the dog he and Kandi shared.

Jake stops at nothing to get away from Charlie and Alan, after they embarrass him out in public.

Alan is showered with love and affection upon returning from the hospital, but Zoey isn't so sure it's deserved.

Alan feels reluctant to make a commitment to Lyndsey, but an unexpected source inspires him; Walden enjoys being the boy-toy of a wealthy older woman.

Walden and Alan think it may be time for Berta to retire when she injures her back at work. When they suggest her retiring, she grows offended, and as the conversation progresses she quits. Walden and Alan then try different maids, with little success.

Walden goes on a date with an accident-prone model; Alan's date reveals surprising personal information about herself to him.

Charlie's 25-year-old daughter arrives at the beach house, hoping to get to know her family.

Charlie's girlfriend gets fed up with his stalker, Rose.

Walden starts to feel his age when a friend's daughter comes to town.

Walden receives divorce papers from Bridget, but forgets his depression when he meets a girl who looks eerily like her.

Alan invests Walden's money in Kate's fashion line; leading a double life takes its toll on Walden.

Alan and Walden befriend three moms at a kids’ gym, but things get complicated when Walden becomes attracted to one of them. Alan goes out for a girls’ night with a group of moms.

Jake has a crush on his chemistry tutor, who has a crush on Walden. Meanwhile, Alan obsesses over the journal his brother left him in his will.

Zoey and Walden break up, causing Walden to experience a breakdown.

Charlie's ghost pays a visit to Alan after he suffers a minor heart attack.

Charlie tries to surf to impress Dottie, a beautiful woman he just met, but after he nearly drowns he is convinced that he saw his late father.

Charlie's attracted to an older self-help author. Alan and Jake clash over a project for school.

When Alan learns Walden knows Lynda Carter, he asks him to set him up on a date with her. Against his better judgment, Walden agrees to invite her to the house for dinner.

Charlie nurses an ailing Alan back to health so they can go on a double date with two sisters, one of whom Charlie's been wanting to date for a long time.

Zoey tries to convince Walden to cut his hair and shave; Alan and Lyndsey revive their relationship.

Charlie helps Alan with his obsession of always having to get approval from the women in his life.

When Walden begins redecorating the beach house, Alan becomes overly emotional.

When Charlie's ex-girlfriend Courtney is released from prison, he treats her to the good life despite her having been in prison for conning him.

Alan and Lyndsey's illicit affair puts Walden in danger, forcing him to accept Rose's help.

Berta discovers that Alan has been dating her daughter Naomi.

Judith is dating Jake's pediatrician, and Alan is upset until Charlie points out that if she remarries, his alimony payments will end.

Charlie meets his match when he falls for a woman who's better at playing hard to get than he is.

Alan starts working for Evelyn as Charlie works to fix the relationship between Chelsea and Jake.

Charlie and Alan hire Berta's sister to cater a party their mother has conned them into throwing for her.

Jake gets lucky after Charlie takes him to the racetrack. Meanwhile, Alan has a difficult time at the DMV.

Jake shares that he has heard his mother having sex with her fiancée, Herb; this revelation brings up a repressed memory for Charlie. This leads Charlie to seek help from Rose.

Charlie learns he can't be in a long-lasting relationship, becuase of unresolved issues he has with his mother. Jake asks Charlie for advice about a girl at school.

Charlie acts strange after spending an evening with his mother, and a woman Alan slept with behaves oddly the next morning.

Alan has a difficult time coping when Lyndsey breaks up with him.

Walden's ex-wife and mother try to take control of his company, so he turns to Alan for help.

The guys go to Evelyn's house to meet the new man she's dating, and Charlie realizes the man's daughter is a woman he's trying to avoid.

Chelsea's illness gives Charlie a chance to prove he can take care of her, but also yearning to run away from the situation.

Charlie is nominated for an advertising award, but he decides to boycott it because his arch nemesis always wins. The rest of his family tries to trick him into going. Rose is having relationship problems with Gordon and seeks help from Charlie.

Charlie and Alan try to set up Evelyn with Russell the pharmacist.

Alan finds out that Lyndsey broke up with Larry without telling him; Walden tries to prove he is a man's man.

Charlie runs off to Vegas and returns with a new wife, but she's not Chelsea.

Worrying Charlie may get rid of one of them, Berta and Lydia fight over him. Meanwhile, Kandi does everything she can to stop Alan from selling their condo.

Alan is overjoyed by the prospect of Judith remarrying, as he would no longer have to pay alimony. Alan gets Charlie to help him when it looks like the marriage maybe derailed due to Jake's dislike of his mother's fiancé.

Alan starts to have financial problems when he starts paying for his girlfriend's bills, so Charlie tries to get him to break up with her. Meanwhile, Judith is after Alan because he is late in paying his alimony check.