Santa Claus Conquers the Martians. It follows the people of Mars who decide to kidnap Santa Claus when their children develop a fascination with him. The result is a festive flop with laughable special effects and a notable lack of Christmas cheer, widely recognised as one of the very worst films ever made. “The plot, such as it is, proves it is possible to insult the intelligence of a three-year-old,” the BBC said in a review, while Time Out called it a “hilariously bad stab at sci-fi”. This is one festive film to forget.