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Walden is taken aback when he gets a surprise visit from his bitter former business partner, who's looking to mend their differences.
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A brush with death drives a wedge between Walden and Zoey; Alan wonders about Lyndsey's drinking habits.
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Alan falls for Walden's mom during her visit, in which she reveals a devastating secret.
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Bridget reappears just as Walden is romancing a new love interest.
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Walden likes a British woman, but both Walden and the woman doubt that he's ready to date yet.
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Alan comes home from the hospital and encounters a series of daunting challenges.
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Walden redecorates, and the change unsettles Alan as it prompts him to think of losing Charlie.
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Jake develops a crush on his Japanese tutor, and his tutor has a crush on Walden. Meanwhile, Alan is fascinated by Charlie's journal, which Charlie left to him.
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Walden receives divorce papers, but then he meets a woman who looks just like Bridget.
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Alan has trouble accepting Lyndsey's seedy movie past, and Walden tries to cheer him up by throwing a party.
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Walden looks for Mrs. Right, and Alan wants Lyndsey back in his life
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Alan gives dating advice to Walden as he prepares to go out with Bridget; and Jake decides to drop out of school because that's what Walden did.
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Judy Greer joins the cast as Bridget, Walden's ex-wife.
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In Part 1 of a two-part ninth-season opener, Ashton Kutcher joins the cast as brokenhearted billionaire Walden Schmidt
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Rose discovers Alan's Ponzi scheme; Alan meets Rose's ``husband''; Charlie tries to get time alone with Rose.
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Charlie and Rose continue their affair; Alan's business becomes a Ponzi scheme.
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Charlie can't get over Rose being married, and he begins to stalk her; and Alan is worried when Jake and Eldridge make videos of each other performing dangerous stunts
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Depressed after his break up with Courtney (Jenny McCarthy), Charlie goes to see his psychiatrist (Jane Lynch).
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Ashamed that he can't afford to buy a birthday present for Lyndsey, Alan gets creative.
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Charlie goes on a spending spree for old fling Courtney when she shows up after being in prison for three years.
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Charlie falls for the woman who replaces Berta on her days off; Alan thinks Lyndsey's ex-husband is stalking him.
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Charlie's girlfriend gets fed up with his stalker, Rose.
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Charlie has difficulty dealing with dating a slightly older woman.
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Alan pretends to be Charlie when he goes out on the town; Charlie sneaks off for cosmetic surgery.
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When Lindsey asks Alan to move in with her, Charlie will do anything to get him to agree to it.
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Jake goes to live with Judith and Herb after learning that Alan has been dating Eldridge's mom; Charlie decides to cut back on his drinking.
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Alan tries for an intimate night at a hotel with his new girlfriend; Charlie tries his own approach to get the ``girlfriend experience.''
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Alan is torn between the bad influence of Jake's new friend and the hotness of his mother.
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Charlie has a return engagement with Gail (Tricia Helfer), Chelsea's best friend; Alan has a surprising effect on a female patient.
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After running off to Las Vegas, Charlie returns with a new wife.
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A bar fight lands Alan in jail; Charlie worries that Chelsea is interested in the lawyer who takes Alan's case.
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Charlie has a colonoscopy to avoid visiting Chelsea's parents, who he then finds in his house when he gets home.
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Charlie discovers a secret that Chelsea's been keeping from him regarding her finances.
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Charlie and Alan awaken to find themselves in bed with a stranger.
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Alan recommends breast-reduction surgery to Chelsea, which prompts Charlie to implement house-guest reduction, as in throwing Alan out.
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Public humiliation at the hands of Charlie and Alan has Jake refusing to stay at the beach house.
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Alan takes a job working for Evelyn; Charlie must mend Chelsea and Jake's rocky relationship.
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Girls rule the roost after Charlie consents to Chelsea's desire to allow Alan's girlfriend, Melissa, to move in with them.
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Charlie must make a difficult decision about his future and with which woman he wants to spend his life: Chelsea or Mia.
