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.
Ethan
Joseph Gordon-Levitt
Isaac
Seth Rogen
Chris
Anthony Mackie
Diana
Lizzy Caplan
Betsy
Jillian Bell
Sarah
Mindy Kaling
Mr. Green
Michael Shannon
Mrs. Roberts
Lorraine Toussaint
Boss
Randall Park
Rebecca Grinch
Ilana Glazer
Joshua
Nathan Fielder
Cindy
Heléne Yorke
Tommy Owens
Aaron Hill
Narrator / Santa
Tracy Morgan
Nana
Darrie Lawrence
Self
James Franco
Self
Miley Cyrus
Kamal
Kamal Angelo Bolden
Self
Baron Davis
Piano Playing Uncle
Chuck Muckle
Cindy's Husband
Curt Bouril
Cindy's Daugher
Brooke Liddell
Cindy's Daughter
Kiley Liddell
Bad Santa #1
Jason Mantzoukas
Bad Santa #2
Jason Jones
Deli Owner
Clem Cheung
Opera Singer
Harolyn Blackwell
Coat Check Girl
Natalie Knepp
Singing Kid
Cameron Earl Thrift
Hunan Waiter
Jeremy Vimes
Karaoke Singer #1
Gabriel Long
Isaac's Daughter
Michaela Sprague
Coat Check Patron
Euan Morton
Old Lady
Marilyn O'Connell
Train Conductor
Richard Hughes
Woman
Theodora Miranne
Exotic Dancer (uncredited)
Nicola Fiore
Party Attendee & Pro Athlete Girlfriend (uncredited)
Aly Mang
Snow Globe Dancer (uncredited)
Marija Skangale
Christmas Bartender (uncredited)
Bill Walters
Tommy's Hot Girl (uncredited)
Hannah Townsend
Karaoke Singer #1 (uncredited)
Oliver Solomon