Santa Claus Conquers the Martians

From publisher blurb: Santa Claus Conquers the Martians: The Official Series Bible is a setting based on a (fictional) television series based on the original film. Players take the role of human, elf, and Martian toymakers, working together to bring peace and understanding while foiling the schemes of naughty people from both planets. It is system-independent, meaning you can use the roleplaying game mechanics of your choice to play it. It’s good for a silly one-shot or a short campaign.