Charlie runs into a former girlfriend who's so looks a lot like he does.

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 tries cooking, Alan tries dating two women at the same time and Jake tries beer.

Charlie romances Alan’s sweet receptionist as Alan anxiously awaits disaster.

The guys bump into Jake’s former teacher who became a stripper after a fling with Charlie. Charlie tries to help her out by giving her a room and a job, but things spiral out of control.

When Judith kicks Herb to the curb, Alan comes knocking.

Alan tries to escape Judith's grasp as Charlie and Herb go on the prowl.

Charlie's new girlfriend asks him to spend the night at her place, while Alan tries to enforce a punishment on Jake.

Jake disappears with the daughter of Charlie's neighbor, a former NFL player, and Charlie is left to cover his back.

Evelyn offers to pay for Jake's college education, leaving Alan to wonder if he ever needs to work again.

Charlie contemplates his lifestyle after hearing an old partner has past away.

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

Judith is pregnant with a baby girl and Alan is convinced that he is the father. Meanwhile, Jake is in a contentious mood and Charlie thinks he knows why.

Feeling Alan’s underappreciated by his family, Melissa offers him the chance to live with her and her mother.

Charlie finds himself in couples counseling

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

charlie abruptly admits his feeelings for chelsa but he gets the response exactly beyond his expectations. soon charlie realizes his mistake and take corrective actions as soon as possible to get her back. he tries to propose her by offering en engagement ring in champagne glass. but chalesa unknowingly swallows the ring.

When Chelsea gets sick, Charlie takes care of her---but he also tries to resist the urge to flee.

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 and Chelsea meet for the first time, and Charlie wants to make sure they never become friends.

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

Charlie mourns the loss of his bachelor pad as he reluctantly allows Chelsea to move in. Meanwhile, Alan discovers there is no longer much space left in the house for him.

As Alan and Chelsea bond, Charlie uses the free time to do the things that he likes to do on his own.

After hearing Mia is back in town, Charlie begins questioning his relationship with Chelsea. Meanwhile, Charlie, Alan and Herb rush Judith to the hospital when she goes into labor.