In New York City for their annual tradition of Christmas Eve debauchery, three lifelong best friends set out to find the Holy Grail of Christmas parties since their yearly reunion might be coming to an end.
Joseph Gordon-Levitt
as Ethan
Seth Rogen
as Isaac
Anthony Mackie
as Chris
Lizzy Caplan
as Diana
Jillian Bell
as Betsy
Mindy Kaling
as Sarah
Michael Shannon
as Mr. Green
Lorraine Toussaint
as Mrs. Roberts
Randall Park
as Boss
Ilana Glazer
as Rebecca Grinch
Nathan Fielder
as Joshua
Heléne Yorke
as Cindy
