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A brush with death drives a wedge between Walden and Zoey; Alan wonders about Lyndsey's drinking habits.
Alan and Lyndsey's mothers meet for the first time; Jake and Eldridge want Walden to drive them to a party.
Walden tells Zoey his new business partner is his ex-wife, Bridget; Alan and Lyndsey struggle to get used to their mothers' relationship.
Walden's relationship is put to the test when Zoey and her daughter become his new housemates. Meanwhile, Alan moves in with Lyndsey.
Kathy Bates guest stars as Charlie's ghost when Alan is hospitalized following a minor heart attack.
Alan gets out of the hospital and is greeted warmly by his loved ones, but Zoey wonders what the fuss is about.
In the ninth-season finale, Jake makes an important decision about his future after graduating from high school.
Alan and Lyndsey vow to liven up their sex life.
Walden begins dating Rose—who was in Paris the day Charlie died—much to Alan's dismay.
Alan has a surprising inspiration when he mulls making a commitment to Lyndsey; Walden enjoys the attention of a wealthy older woman.
Alan is surprised that his second ex-wife, Kandi, wants him back in her life. Meanwhile, Walden tries to make Berta's birthday special when she would rather not acknowledge it.
Alan is alone for Christmas, while Walden continues to play his poorer alter ego.
Walden is ready to tell Kate the truth about his identity when he and Alan go to her fashion show in New York.
Lyndsey is miffed when Alan won't give her a key to the beach house, so she decides to go on a date with a gynecologist. Meanwhile, Alan, Walden, Herb and Billy trade tales of their romantic woes.
The dweebs head to Fort Lauderdale for a national conference where the jocks try to have the wonks' fraternity dissolved.
Walden pleads with Kate to give their romance another shot when he's lonely on Valentine's Day. Meanwhile, Alan's holiday with Lyndsey doesn't proceed as he'd hoped.
Walden runs into his ex-wife, Bridget, at a singles event, and their conversation turns to reconciliation, but Alan worries that they're no longer compatible.
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