Joel McHale

Character: Boyd Mitchler

Lauren Graham

Character: Luann Mitchler

Clark Duke

Character: Nelson Mitchler

Oliver Platt

Character: Hobo Santa

Wendi McLendon-Covey

Character: Shauna Welnke

Tim Heidecker

Character: Dave Welnke

Candice Bergen

Character: Donna Mitchler

Robin Williams

Character: Mitch Mitchler

Pierce Gagnon

Character: Douglas Mitchler

Bebe Wood

Character: Vera Mitchler

Ryan Lee

Character: Rance Welnke

Amara Miller

Character: Pam Welnke

Mark Proksch

Character: Trooper Zblocki

Jeffrey Tambor

Character: Snowman (voice)

Amir Arison

Character: Farhad

Steele Gagnon

Character: Cale Weinke

J.J. Jones

Character: Young Boyd

Gene Jones

Character: Glen

Matt Jones

Character: Cowboy Dick

Barak Hardley

Character: Cowboy Bob

William Sanderson

Character: Father Juge

Karan Kendrick

Character: Mom at Santaland Village

Parisa Johnston

Character: Farhad's Wife

Michael Shikany

Character: Afgan Doctor

Janet Meshad

Character: Farhad's Grandmother