Walden decides to foster a 6-year-old boy, but begins to doubt himself when they don't bond like he expected. Edan Alexander joins the cast as Louis, the foster child. (TV-14 L)
Walden and Alan meet a birth mother who's considering them to adopt her baby. Maggie Lawson guest stars as a social worker helping Walden and Alan adopt a child. (TV-14 D, L)
Alan and Walden have a meeting with an adoption social worker that hinges on them being convincing as a loving couple. Meanwhile, Lyndsey returns after 60 days in rehab. (TV-14 D, L)
When Walden asks Alan to sign a pre-nup, Alan gets offended and has second thoughts about getting married. Michael Bolton returns as himself. (TV-14 D, L)
Following a health scare on Halloween, Walden decides to reprioritize his life with Alan's help. Aisha Tyler guest stars as Walden's lawyer. (TV-14 D, L)
Walden Schmidt and Alan Harper (Ashton Kutcher and Jon Cryer) have spent another year searching for the ideal life in their Malibu beach house. In the 12th and final season, Alan and Walden will continue their search for true love, contentment and the meaning of life. And they may actually find a couple of those things!
Alan confesses his true identity to Larry and has to face the consequences on the Season Eleven Finale. Guest star Kimberly Williams-Paisley returns as Alan's fiancée Gretchen, alongside her real-life husband BRAD PAISLEY who makes a cameo appearance.
Alan's girlfriend, Gretchen, insists that he confess his true identity to Larry. Meanwhile, Walden goes on a road trip with Jenny and Barry to see his first car.
Alan stumbles upon an opportunity to make money. Meanwhile, Walden has to address his co-dependency issues.
Walden reconnects with Kate and is sure she's "The One" – that is, until he meets Vivian (guest star MILA KUNIS – That '70s Show, Black Swan), a beautiful, free-spirited world traveler who shows up on his doorstep. Feeling an instant connection with Vivian, he soon becomes convinced that she's "The One." Meanwhile, Alan and Gretchen grow closer.
Walden gets an invitation to his ex-girlfriend's boutique opening. Meanwhile, Gretchen wants to spend more time at Alan's (aka Jeff Strongman) house. BROOKE D'ORSAY returns as Walden's ex-girlfriend Kate.
Lyndsey discovers that Alan is sleeping with Larry's sister, Gretchen. Meanwhile, Walden struggles with telling Barry (guest star Clark Duke) to find his own place.
Walden suspects his new girlfriend is cheating on him. Meanwhile, Alan gets even more intertwined in Lyndsey and Larry's relationship when he starts dating Larry's sister, Gretchen (guest star KIMBERLY WILLIAMS-PAISLEY).
Alan gives Lyndsey the option of choosing between him and Larry. Meanwhile, Jenny fears that she and Brooke are growing apart.
After Alan learns that Lyndsey broke up with Larry and didn't tell him, he makes a big decision. Meanwhile, Walden sets out to prove that he's a man's man.
After multimillionaire Marty Pepper proposes to Evelyn, Walden and Alan throw him a bachelor party with several of his old friends (comedy legends TIM CONWAY, STEVE LAWRENCE and GARRY MARSHALL guest star) who help him celebrate his last days of bachelorhood.
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