This pilot is the second pilot for South Park, originally made as a video Christmas card. More known as the "Santa Vs. Jesus" pilot (as the first pilot from 1992 has the same title, but is known as Frosty Vs. Jesus), this pilot would set the characters tropes that would carry onto the show (like Kyle being Jewish), and the formula, as the boys meet Jesus, who has come to South Park to reclaim his birthday from Santa, leading to a fight between the two (set to music from Mortal Kombat 3, no less). Almost 30 years since it was made, this special still stands out (especiall as the show it spawned would eventually lose the charm it had and become just another raunchy cartoon that some people lost interest in). This was back from before South Park was a show, and it had the formula down and worked a lot (even having a moral about the holidays).
Review of The Spirit of Christmas
