Joel McHale as Boyd Mitchler

Lauren Graham as Luann Mitchler

Clark Duke as Nelson Mitchler

Oliver Platt as Hobo Santa

Wendi McLendon-Covey as Shauna Welnke

Tim Heidecker as Dave Welnke

Candice Bergen as Donna Mitchler

Robin Williams as Mitch Mitchler

Pierce Gagnon as Douglas Mitchler

Bebe Wood as Vera Mitchler

Ryan Lee as Rance Welnke

Amara Miller as Pam Welnke

Mark Proksch as Trooper Zblocki

Jeffrey Tambor as Snowman (voice)

Amir Arison as Farhad

Steele Gagnon as Cale Weinke

J.J. Jones as Young Boyd

Gene Jones as Glen

Matt Jones as Cowboy Dick

Barak Hardley as Cowboy Bob

William Sanderson as Father Juge

Karan Kendrick as Mom at Santaland Village

Parisa Johnston as Farhad's Wife

Michael Shikany as Afgan Doctor

Janet Meshad as Farhad's Grandmother