Beverly Hills Cop: Max Elf
The seasonal crossover you didn't think you needed...
Foley discovers that the big bad from the second movie, Max Dent, was brought back from the dead by Alan Mask, a crackpot gene therapy billionaire with a hatred for Christmas born out of an unhappy childhood.
After being filled with the reviving DNA of scores of kidnapped Santa's Little Helpers held prisoner by Mask's secret army at a Black Site just outside the Arctic, Max became a cunning human/elf hybrid, and in time inveigled his way into Father Christmas' inner circle - ousting the beloved Buddy Elf after fabricating evidence of inappropriate relationships with reindeer.
At his wit's end, Buddy investigates his nemesis in full red-string-mind-map fashion until he eventually uncovers proof that Max is about to have Santa assassinated and assume the Red Hat himself.
Buddy decides he cannot take him on alone, and so reaches out to the one man who has stopped Max before...