..
The writers of NCIS used Krampus as an idea behind a story.. Here is a bit on him and a site to read more.

Saint Nicholas (known as Santa Claus in America and Father Christmas in Britain), is a benevolent figure who rewards good children, but his shadow companion, Krampus, is a frightening, horned beast who punishes children when they misbehave. ... In parts of Europe, the Feast of St. Nicholas is celebrated on Dec. 6

"Because Krampus is coming to get you." ... In fact, Krampus' roots have nothing to do with Christmas. Instead, they date back to pre-Germanic paganism in the region. His name originates with the German krampen, which means "claw," and tradition has it that he is the son of the Norse god of the underworld, Hel.

More on Krampus here

http://krampusfest.com/origin.htm

Have a good day and stay warm

Blessing
Cyn Ann