Mr. Hankey The Christmas Poo (S1E9)
Merry Christmas, Charlie Manson! (S2E16)
Mr. Hankey’s Christmas Classics (S3E15)
A Very Crappy Christmas (S4E17)
Red Sleigh Down (S6E17)
It’s Christmas In Canada (S7E15)
Woodland Critter Christmas (S8E14)
Black Friday Trilogy (S17E7-9)
HappyHolograms (S18E10)
Bike Parade (S22E10)
Christmas Snow (S23E10)
South Park: Post COVID (S24E3-4)
Post COVID is really a stretch since it’s only one sequence at the end of the 2nd episode so I wouldn’t really count that.
I have to go with the OG, but also the Christmas Classics episode. I’m a sucker for anything Mr. Hankey to be honest.
I only put it because it was around the Holiday Season. And at the end of The Return of COVID they are all gathered for the Holidays.