Mia's return finds Charlie questionning how devoted he is to Chelsea. Alan tries to write a screenplay. The guys rush a laboring Judith to the hospital.

Charlie seeks to take advantage of Alan and Chelsea's budding friendship. Alan takes up ventriloquy.

Both Charlie and Alan face lifestyle changes when Chelsea moves into the house.

Alan lets Chelsea fix him up on a blind date with one of her friends—Rose.

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

Chelsea's discovery of naked pictures of another woman on Charlie's iPhone leads to his swapping stories of sexual experiences during a drunken night with Alan, Herb, and Jerome.

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

Charlies admission that hes in love with Chelsea gets a surprising reaction from her.

With Chelsea soon to arrive, Charlie must find a way to get a half-naked date out of his bedroom.

Charlie agrees to go with Chelsea to couples counseling with Dr. Linda Freeman.

After a birthday party she throws for Alan is met with indifference by his family, Melissa feels he's underappreciated and offers him the chance to live with her and her mother.

Alan continues to believe that he is responsible for Judith's pregnancy. Charlie is convinced he knows the reason behind Jake's bad mood.

Alan finds himself attracted to his receptionist, while Charlie and Jake compete for a waitress.

Charlie finds himself re-examining his wild ways after an old friend dies during a visit.

Alan contemplates retiring when Evelyn states that she'll take care of Jake's college education.

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.

A new girlfriend wants Charlie to sleep over. Meanwhile, Alan has trouble making a punishment stick to Jake.

Alan tries to get away from Judith. Meanwhile, Charlie and Herb go out on the town.

When Judith kicks Herb out of the house, Alan hopes for reconciliation.

Charlie tries to help Jake's former teacher, who became a stripper after dating him, but things go from bad to worse when she has a religious conversion.

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

Alan, Jake, and Charlie all decide to try new things: Alan is dating more than one woman, Charlie learns to cook, and Jake experiments with beer.

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 tha

Charlie discovers an ex has a child that looks remarkably like him.