Dean Winters Dean Winters

NBC's Up All Night is giving Will Arnett's Chris a brother, and the actor playing him has some impressive TV street cred.

Actor Dean Winters — known for his roles as Rescue Me's Johnny Gavin, 30 Rock's Dennis Duffy, Terminator: The Sarah Connor Chronicle's Charley Dixon, Oz's Ryan O'Reily and Law & Order: SVU's Brian Cassidy — will appear on the NBC sitcom in early 2012 as Chris's competitive brother, Casey.

And as a bonus for you Up All Night fans, here's an exclusive preview clip from this week's episode, "First Christmas," airing Wednesday, December 7 at 8/7c, with guest appearances from Jason Lee and Blythe Danner.

The freshman sitcom's first holiday episode finds Christina Applegate's Reagan going to great lengths to make daughter Amy's first Christmas picture perfect. That means swallowing her pride and getting help from her own mom (Danner). Meanwhile, Chris hits the mall in search of the perfect gift for his wife, and over at the TV studio, Maya Rudolph's Ava frets that she may lose boyfriend Kevin (Lee), when he opts to spend the holiday with his ex-wife.

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