Im hoping someone here can help me find the name of an old episode of Night Gallery or The Twilight Zone, im not sure which. The episode looked like it was from the 70's or ealry 80's. The main plot of the episode as far as i can remember had aliens invading earth and the story focused on a group of about 4 people trying to hide from one of the aliens. After a few near misses they finally become cornered by the alien and they shoot it. Upon examining the dead alien they find out that all it wanted to do was tell them merry christmas. It has been a long long time since i saw this so my details might be a bit screwed up, but thats the main gist of it. I appreciate any help.