Dennis, Mac, and Frank go into real estate, while Dee sets out to be a surrogate for a wealthy couple. Charlie gets into it with an attorney over the law.

Alan and Lyndsey’s illicit affair puts Walden in danger, forcing him to accept Rose’s help.

Depressed on Valentine’s Day, Walden tries to talk Kate into giving him another chance; Alan’s holiday plans go south.

Walden must choose between Zoey and Rose.

Despite Alan’s warnings, Walden starts dating Rose.

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

Alan makes wedding plans for Evelyn and Teddy, while Charlie figures out how to get more acquainted with his future step-sister.

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

Jake shares that he has heard his mother having sex with her fiancée, Herb; this revelation brings up a repressed memory for Charlie. This leads Charlie to seek help from…

Charlie returns to his bachelor lifestyle after Alan moves out of the house. Alan suffers a breakdown after his divorce from Kandi.