Overview: Walden plans a big surprise for Zoey's birthday.
Overview: Zoey and Walden break up, causing Walden to experience a breakdown.
Overview: Alan and Lyndsey decide to spice things up in the bedroom.
Overview: Walden starts to feel his age when a friend's daughter comes to town.
Overview: Despite Alan's warnings, Walden starts dating Rose.
Overview: Walden must choose between Zoey and Rose.
Overview: 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.
Overview: 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.
Overview: Alans famous ex-wife, Kandi, wants to reconcile; when Berta isn't interested in celebrating her birthday, Walden tries to make her day special.
Overview: Alan helps Walden create a new identity so he can avoid women who are only interested in his money.
Overview: Walden juggles his two identities; Alan ends up alone on Christmas.
Overview: Alan invests Walden's money in Kate's fashion line; leading a double life takes its toll on Walden.
Overview: Alan and Walden go to Kate's fashion show in New York so Walden can reveal the truth about his identity.
Overview: 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.
Overview: When Jake brings his 36-year-old girlfriend home for a visit, Alan is concerned; Walden tries to hide something from Alan.
Overview: Depressed on Valentine's Day, Walden tries to talk Kate into giving him another chance; Alan's holiday plans go south.
Overview: When Walden runs into his ex and they start talking about getting back together, Alan worries that she is not good enough.
Overview: After a fight with Walden, Alan decides to move in with Herb.
Overview: Alan and Walden end up partying too hard as they try to cheer up Herb.
Overview: Walden and Alan are caught in the crossfire when Jake cheats on his girlfriend (Jaime Pressly) with her 18-year-old daughter.
Overview: Alan has a difficult time coping when Lyndsey breaks up with him.
Overview: With encouragement from Walden, Alan decides to update his look; Alan is faced with a moral dilemma when he attracts a married woman.
Overview: 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.