Ellie Kemper as Pam McKenzie

Rob Delaney as Jeff McKenzie

Archie Yates as Max Mercer

Aisling Bea as Carol Mercer

Pete Holmes as Uncle Blake

Kenan Thompson as Gavin Washington

Timothy Simons as Hunter

Ally Maki as Mei

Chris Parnell as Uncle Stu

Devin Ratray as Buzz McCallister

Katie Beth Hall as Abby McKenzie

Max Ivutin as Chris McKenzie

Andy Daly as Mike Mercer

Madeline Holliday as Katie Mercer

Mikey Day as Priest

Jordan Carlos as Clem Breckin

Esther Povitsky as Daisy Breckin

Marty Adams as Annoying Passenger

Jim Rash as Bell Choir Leader

Catherine Cohen as Mrs. Claus

Amy Okuda as Ticketing Agent

Bronwen Mantel as Barbara

Peter Schoelier as Herman

Tristan D. Lalla as Orderly

Nancy Helms as Enthusiastic Orderly

Gayle Garfinkle as Old Lady Coven

Jane Gilchrist as Old Lady Coven

Hazel Gorin as Old Lady Coven

Cara Ricketts as Aunt Beth

Aiden Wang as Ollie

Allan Wang as Ollie

Amadeo Correia as Young Chris McKenzie

Aron Benali as Ryan

Emilio Williams as Stu's Child #1

Sylvia Simonetti as Stu's Child #2

Osias Reid as Burke Son #1

Dylan Eugene Olivier as Burke Son #2

Deryk Eugene Olivier as Burke Son #3