In the twelve days leading up to Christmas, the residents of the snowy and isolated town of Woodridge are being murdered in a variety of gruesome ways by a psychotic Santa and Mrs. Claus. While the small-town cops scramble to protect the townsfolk, the killings seem to center around one young woman who may be the final victim on Santa's list. As the slaughter continues and the bodies pile up, it seems that nothing and no one may be able to stop the murderers before they complete their own deadly take on the twelve days of Christmas.
Unfortunately the movie Once Upon a Time at Christmas is not yet available on HBO Max.
| Production | Phillip B. Goldfine | Executive Producer |
| Production | Mem Ferda | Producer |
| Editing | Robert Gajic | Editor |
| Production | Benjamin Sacks | Executive Producer |
| Production | Paul Tanter | Producer |
| Production | Simon Phillips | Producer |
| Production | Stan Wertlieb | Executive Producer |
| Crew | Daryl Gilmore | Cinematography |
| Art | Damien McPhillips | Production Design |
| Production | Barry Brooker | Executive Producer |
| Directing | Paul Tanter | Director |
| Production | Milan Friedrich | Executive Producer |
| Writing | Christopher Jolley | Screenplay |
| Writing | Simon Phillips | Story |
| Writing | Paul Tanter | Story |
