It should go without saying, but just in case:

Pretty much every crossover on this site contains at least one, and usually rather more, spoilers. Largely because it's impossible to talk coherently about these things without a level of detail that makes spoilage impossible to avoid.

This applies equally to roleplaying game lines and more traditional media sources. Just so you know.

So, if you haven't seen, read, played - whatever - the material in question, you might want to consider not looking at the relevant parts of the site. These crossovers are here for your enjoyment - and how much are you really going to enjoy something when you don't know what it's about, anyway?