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

Alan has trouble accepting Lyndsey’s seedy movie past, and Walden tries to cheer him up by throwing a party.

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

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

Walden deals with his ex-wife, Bridget.

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

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

While Charlie and Rose carry on their “affair,” Alan’s chiropractic business turns into a Ponzi scheme.

Obsessed and believing her to be married, Charlie starts stalking Rose. Jake and Eldridge start taping themselves doing Jackass-style stunts.

Alan feels paranoid when Lyndsey becomes friendly with Charlie.

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

Alan goes to great lengths to be able to get Lyndsey a nice birthday present.

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.

When Berta takes a couple of days off, Charlie falls for her replacement. Meanwhile, Alan believes he’s being stalked by Lyndsey’s ex-husband.

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

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

Charlie has difficulty dealing with dating a slightly older woman.

Alan pretends to be Charlie when he goes out on the town; Charlie sneaks off for cosmetic surgery.

Lyndsey and Eldridge move into Charlie’s house after their home burns down.

After moving in with Lyndsey, Alan continues to have a rendezvous with Melissa at Charlie’s house.

Charlie is willing to do anything for Alan to accept Lyndsey’s offer to move in with her.

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.

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 is visited by the ghosts of his ex-girlfriends while Alan and Jake are on a road trip.

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

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

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

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

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

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

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 his house.

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.

Jake is taught the art of infidelity by Charlie, whose girlfriend is away for Christmas.

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

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

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

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

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.

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