A Christmas movie that I've grown very fond of over the years is:

Santa Claus Conquers the Martians

I've posted a few covers from various DVDs and a poster. It's an insane, horribly-acted piece of bizarreness, but man does it make me feel like a kid at Christmas again! It really seems to capture that childhood feel for me. Just a ton of fun to watch, and the theme song will stick in your head all season long. Trust me!

Have been hearing about this film for decades...perhaps time to see what all the reviews are about!