I have no idea what my emotions are supposed to be!
You should also watch it. Santa Claus is on DVD, Netflix Instant Watch, and here:
I think Santa Claus Conquers the Martians is the more popular of the two MST3K Christmas episodes, but that's mainly because the movie has a weird Baby Boomer cult thing going for it. But Martians is dull and plodding and grating, even if it still makes for a funny episode. (Cinematic Titanic revisited it 16 years later and improved things a little.)
Santa Claus involves the titular hero fighting the devil on Christmas Eve for the fate of children's souls, and it's mostly carried by this premise alone and its inherent creepiness. And just like in Martians, Santa Claus himself is insane and bipolar and terrible at his job. Then it gets weird. Just watch it so I have something to talk to someone about.