Fools! You all have different answers to the Ultimate Question! I must kill you all! The fact that it is an absurdist comedy show implies that there is no reason for anything, other than to be funny. The XII is in he title because it's more absurd than "Part II," and plus maybe because it's futuristic and futuristic things in fiction tend to have high numbers (like, "[Insert Future Technological Device Here] 2000" or something). That is the most rational answerkill all the heretics!