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I Changed My Mind About the Milk Walden plans a big surprise for Zoey's birthday.
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A Big Bag of Dog Zoey and Walden break up, causing Walden to experience a breakdown.
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Four Balls, Two Bats and One Mitt Alan and Lyndsey decide to spice things up in the bedroom.
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You Do Know What the Lollipop's For Walden starts to feel his age when a friend's daughter comes to town.
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That's Not What They Call It in Amsterdam Despite Alan's warnings, Walden starts dating Rose.
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Ferrets, Attack! Walden must choose between Zoey and Rose.
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Avoid the Chinese Mustard When Walden gets tired of the complications that come with a traditional relationship, he hires an actress to be his girlfriend; Jake plans a rendezvous with Missi (Miley Cyrus) at the beach house.
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Something My Gynecologist Said Alan feels reluctant to make a commitment to Lyndsey, but an unexpected source inspires him; Walden enjoys being the boy-toy of a wealthy older woman.
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I Scream When I Pee Alans famous ex-wife, Kandi, wants to reconcile; when Berta isn't interested in celebrating her birthday, Walden tries to make her day special.
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One Nut Johnson Alan helps Walden create a new identity so he can avoid women who are only interested in his money.
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Give Santa a Tail-Hole Walden juggles his two identities; Alan ends up alone on Christmas.
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Welcome to Alancrest Alan invests Walden's money in Kate's fashion line; leading a double life takes its toll on Walden.
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Grab a Feather and Get in Line Alan and Walden go to Kate's fashion show in New York so Walden can reveal the truth about his identity.
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Run, Steven Staven! Run! Alan is faced with relationship trouble when he does not give Lyndsey a key to the beach house; Walden, Alan, Herb and Billy commiserate about relationships.
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Paint It, Pierce It or Plug It When Jake brings his 36-year-old girlfriend home for a visit, Alan is concerned; Walden tries to hide something from Alan.
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Advantage: Fat, Flying Baby Depressed on Valentine's Day, Walden tries to talk Kate into giving him another chance; Alan's holiday plans go south.
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Throgwarten Middle School Mysteries When Walden runs into his ex and they start talking about getting back together, Alan worries that she is not good enough.
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The 9:04 from Pemberton After a fight with Walden, Alan decides to move in with Herb.
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Big Episode. Someone Stole a Spoon Alan and Walden end up partying too hard as they try to cheer up Herb.
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Bazinga! That's from a TV Show Walden and Alan are caught in the crossfire when Jake cheats on his girlfriend (Jaime Pressly) with her 18-year-old daughter.
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Another Night with Neil Diamond Alan has a difficult time coping when Lyndsey breaks up with him.
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My Bodacious Vidalia With encouragement from Walden, Alan decides to update his look; Alan is faced with a moral dilemma when he attracts a married woman.
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Cows, Prepare to Be Tipped Walden dates an attractive 22-year-old (Hilary Duff), but ends up being more interested in her grandmother (Marilu Henner); Jake and Alan go on a trip.