Jake hopes to win back Celeste by writing her love songs. Alan and Herb hope to keep Judith from finding out they’ve become friends.

Charlie opts to have a colonoscopy in order to avoid going on a trip with Chelsea to see her parents. However, when he returns home, he finds her parents at…

Charlie suspects Chelsea likes the lawyer representing Alan after his arrest for a bar fight.

Chelsea and Charlie’s relationship is at risk when Charlie’s jealousy comes between them.

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

Charlie and Chelsea have a post-breakup one-night stand.

Charlie has a return engagement with Chelsea’s best friend, while Alan has an unexpected effect on a new female patient.

Alan is torn between the bad influence of Jake’s new friend and the hotness of his mother.

Alan tries for an intimate night at a hotel with his new girlfriend, while Charlie takes a different approach to obtain the “girlfriend experience”

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.

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

While Alan struggles to cure his baldness, Charlie deals with the problem that he can’t satisfy Chelsea.

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

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

Charlie must make a difficult decision about his future and with which woman he wants to spend his life: Chelsea or Mia.

When Chelsea convinces Charlie to let Alan’s new girlfriend, Melissa, move in, the girls end up taking over Charlie’s house.

Alan ends up playing maid to Judith’s new baby as well as his former mother-in-law. Meanwhile, Jake uses an incriminating photo to blackmail Charlie.

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

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

Alan feels Charlie is unable to control his womanizing ways.

Rose returns from England, and plays nurse rather oddly for an ill Charlie.

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

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

Charlie double-dates with Jake and fixes Alan up with a hooker.

Charlie’s admission that he’s in love with Chelsea gets a surprising reaction from her

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

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…

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

When Alan finds himself wanting to break up with a woman, Charlie offers his expertise.

Alan tries to escape Judith’s grasp as Charlie and Herb go on the prowl to pick up women. They later end up going back to Herb’s hotel room with two…

Charlie and Linda get closer to consummating their relationship, but Charlie has trouble focusing when he begins to see Rose’s face everywhere he turns.

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…

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

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.

Charlie’s girlfriend is embrassed to go out in public with him. Meanwhile, Jake sneaks out to attend a concert.

In the 6th season opener, Charlie runs into an ex-girlfriend and a child who bears a striking resemblance to Charlie.

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…

Alan is sure that things will turn bad when Charlie starts dating his receptionist.

When Judith kicks Herb to the curb, Alan comes knocking; Jake is sent to stay with a less-than-willing Charlie for three months during Judith’s meltdown.