Charlie runs into an ex with a child who looks and acts a lot like him. He begins to suspect that he is the child's father.

Charlie kicks Alan out the house again after Alan demands that Charlie pay him back the $38 he owes him. Alan and Jake are now forced to turn to Judith and Herb for a temporary home.

Alan tries to date two women at once and Charlie tries to learn how to cook. Jake tells Alan that he's studying with a friend, but he gets drunk instead.

Alan is angry when Charlie hooks up with his secretary because he knows that the situation will end badly for him after their inevitable breakup.

Charlie gets more than he bargained for when he tries to make amends to one of Jake's old teachers that he dated, who went off the deep end and became a stripper after he broke up with her.

Alan is overjoyed when he learns that Judith and Herb's marriage is on the rocks, but he gets more than he bargained for when he tries to fake-comfort her. Meanwhile, Herb tries picking up women with Charlie's help.

Alan and Judith start seeing each other again after Judith's breakup with Herb, Herb continues to turn to Charlie for help picking up women, and Charlie messes with Jake by threatening to get him sent to military school.

Charlie's month-long relationship threatens to go down the tubes when she asks him to spend the night at her house instead, and Alan grounds Jake for mooning some girls on a school bus.

Alan realizes what a babe magnet Charlie's car can be, while Charlie is left with the neighbor when his daughter disappears with Jake.

When Evelyn offers to pay for Jake's college education and a car, Charlie suspects that she has an angle to play.

Charlie contemplates making some changes in his life after an old buddy and partner in crime drops dead on the balcony of his beach house.

Alan considers hooking up with his receptionist--until he meets her mother, and Charlie and Jake fight for the affection of a beautiful woman

Judith is pregnant, Alan believes he is the father, and Judith tries to keep him away from Herb. Meanwhile, Charlie tries to figure out why Jake is so irritable.

After his family acts mean-spirited during Alan's surprise birthday party, Alan decides he's had enough and moves in with his girlfriend and mom.

Charlie's big mouth and lack of attention to details gets him in couples counseling with his girlfriend.

Charlie needs Alan and Jake's help getting rid of the drunk, half-naked bimbo passed out in his bed when his girlfriend tells him she's coming home early from a funeral.

Charlie is so desperate to get Chelsea to return his accidental I love you and not lose control in the relationship that he is willing to propose to her just to make her say it.

Charlie has trouble trying to take care of Chelsea when she gets sick.

Charlie, Alan and Herb get together when they all have problems with their significant others; Charlie with Chelsea because of some topless photos an ex of his sent him, Alan with Melissa for sleeping with her mother while stoned and Herb with Judith because of arguments set off by hormones. Written by J. Rieper

Charlie is disturbed when his mother meets Chelsea and starts spending time with her, but he has a plan for revenge.

Chelsea sets up Alan with her new friend Rose--the same Rose who stalked Charlie for years. But to Charlie's surprise, the two of them hit it off.

When Chelsea's lease is up, Charlie reluctantly agrees that they should live together, but he has second thoughts about everything once the moving in process begins and Chelsea starts to nest, while the rest of the household has mixed reactions. Written by Moviedude1

Charlie is angry when Alan and Chelsea become good friends, until he figures out how to use the situation to his advantage.

Chelsea is jealous when Charlie's ex fiancé, Mia, calls him--perhaps rightfully so. Meanwhile, Judith goes into labor, Herb is incapacitated, and Alan runs into his ex-girlfriend and receptionist at the hospital.