WAREHOUSE 13’s holiday episode is ‘Secret Santa’.
“Pete and Myka are called upon to hunt down a malevolent Santa Claus. Meanwhile, in time for Hanukkah, Artie and his estranged father, Isadore Weisfelt (guest star Judd Hirsch), reunite after 30 years.
Paul Blackthorne also guest stars.”
Apparently a stand-alone episode not referencing the season finale, WAREHOUSE 13’s ‘Secret Santa’ airs Tuesday, December 7th at 10:00 PM ET/PT.