This being the holiday season we thought we might look at some of the hurdles that jolly old St. Nick must overcome but once a year. And if humans ever leave earth, the problems get even worse. Fusion reindeer and black hole bar fridges are some of the hypotheses we put forward.

Yet with melting sea ice at the north pole, competition for ownership of Santa's backyard has become more serious. We look at what the squabblers are fighting over.

We discuss just a few of the seemingly endless Santa films, and what they say about the fat old man.

The merriest of quizzes closes the show.