Silent Night Deadly Night (1984)

AKA: –
Directed by: Charles E. Sellier Jr.
Starring: Robert Brian Wilson (Billy Chapman), Danny Wagner (8-year-yld Billy), Jonathan Best (5-year-old Billy), Lilyan Chauvin (Mother Superior), Gilmer McCormick (Sister Margaret), Charles Dierkop (Killer Santa), Toni Nero (Pamela), Randy Stumpf (Andy), Britt Leach (Mr. Sims), Will Hare (Grandpa), Alex Burton (Ricky Chapman)
Country: USA; Effed Up American Movies
Language: English (Optional Eng Subs)
Runtime: 01:24:51
Genres: Religious-themes, Childhood, Gruesome

Plot – Spoilers:
Family driving through snowy peak country on a visit to Grandpa. Smarmy smiles from Dad and Mum and happy-family conversations with kid in the back. And then Evil Santa arrives, bringing lifelong trauma rather than yuletide cheer. The kid survives and grows up in an orphanage where Mother Superior supplements Evil Santa’s earlier presents by infusing guilt and a twisted version of right and wrong, particularly in sexual matters.

The version here is from a release where the censored scenes were edited into the theatrical cut, leading to fairly obvious changes in quality and colour during the scenes.