I'm pretty sure it's fair to say Santa is one of the most frequently depicted characters in media. Everyone knows him, everyone has a general idea of how everything about him works. Elves, North Pole, reindeer... ect...

Strange as it might seem, this is a relatively modern phenomenon. Other cultures had their own gift givers. In Mexico, it was the Three Kings (AKA the Magi and Three Wise Men). So todays feature is a bit... odd.

Simply titled "Santa Claus", it was released in Mexico in 1959, before being dubbed, slightly edited, and released in the US in 1960.

Santa is a being from the fifth dimension (The jury is still out on what happens when you make him say his name backwards...) , who lives in a castle high up above the earth. He is assisted by Merlin the Wizard (yes, that Merlin), Vulcan, the Roman god of the Forge, and dozens of Children from around the world, who do the actual toy making work and who may or may not actually be what they say they are. One of Santa's helpers, a kid named Pedro, asks what people on Earth eat... which gets into weird areas when you think about it.

Santa spends Christmas Eve traveling the world, delivering gifts, while dogging the attacks of a devil named Pitch, sent to stop Santa by Lucifer (who in the English version is voiced, quite obviously, by the same actor who voiced Santa... It's a bit jarring).

not making a word of this up...

("The Power of Claus compels you!")-someone on TVtropes. 

For something that should be wholesome... It's actually got some serious nightmare fuel... So much so, it's feature on Mystery Science Theater 3000 is considered the source of the phrase.