Dennis and Dee decide to teach Frank a lesson "A Christmas Carol"-style, and Mac and Charlie learn some shocking things about their childhood Christmas traditions.
Charlie Day
as Charlie Kelly
Glenn Howerton
as Dennis Reynolds
Rob Mac
as Ronald "Mac" McDonald
Kaitlin Olson
as Deandra "Sweet Dee" Reynolds
Danny DeVito
as Frank Reynolds
David Huddleston
as Eugene Hamilton
Gregory Scott Cummins
as Luther McDonald
Sandy Martin
as Mrs. McDonald
Lynne Marie Stewart
as Bonnie Kelly
Pablo Schreiber
as Ricky Falcone
Ryan Michelle Bathe
as Woman Office Worker
Mike Beaver
as Man Office Worker
