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Walden's been hidden away for a few days mourning the end of his relationship with Zoey. What's he been doing? Building a lego dream house of course...and decorating the ...

Episode

In the season finale, Walden dates ditzy 22-year-old Stacey (guest star Hilary Duff) while Jake and Alan go on a father-son bonding trip to the Grand Canyon.

Alan gets a "breakover" (i.e. post-breakup makeover)! When Walden encourages a depressed Alan to update his look and start dating again.

Jake visits for the weekend and it's the start of a whole heap of trouble involving tattooed mothers (guest star Jaime Pressly), slutty daughters and a used-car salesman!

After helping Walden out of a twisted situation, Herb asks him for advice about how to get over Judith. Walden decides to show him...

When Alan almost burns the beach house down (not another one!), Walden is less than happy with him. Could our mismatched duo go their separate ways?

Walden is feeling kind of down about the lack of love in his life, must be time for a high-class dating service! Now, who might pop up?

Kate is back in town and she wants to see Walden. Alan decides to treat Lyndsey to a no expense spared Valentine's Day. What could go wrong? Well, the 'manscaping' for a start.

Alan makes a decision that causes problems with Lyndsey and finds himself commiserating with his fellow, suddenly single friends, Walden, Billy and Herb.

Alan makes a decision that causes problems with Lyndsey and finds himself commiserating with his fellow, suddenly single friends, Walden, Billy and Herb.

Walden finally realises it's time to come clean with Kate - but can she forgive him? Or is Walden doomed to fantasy musical sequences... forever!

Walden (or is it Sam?) comes up with a plan to invest in Kate's fashion designs, and for just how long can Walden keep the 'Sam Wilson' act up for?

Walden juggles having two very different identities, while Alan finds himself alone at Christmas.

Walden is disillusioned with always getting what he wants because of his riches - time to start slumming it as an average Joe! Could true love come knocking?

Just as Alan has committed to Lindsey, flirtatious ex Candi pops up - will Alan be able to resist?

Walden becomes a "boy toy" for a rich older woman as Alan struggles to make a long-term commitment to Lyndsey.

Zoey comes back into Walden's life, which forces him into making a decision between her and Rose.

Despite Alan's warnings, Walden starts dating Rose.

Walden starts to feel his age when a friend's daughter comes to town. Actress Miley Cyrus guest stars as Missi, the friend who comes to visit for a week and develops a ...

Alan and Lyndsey decide to spice things up in the bedroom.

Following his break-up with Zoey, Walden has a breakdown.