Alright, so the premise is simple, combine two different intellectual properties and tell a story using one world as the 'world' with the other as the plot. Poster A provides IP 1 Poster B provides IP 2 Poster C describes a 'story' with IP 1 & 2 as well as stating IP 3 Poster D describes a 'story' with IP 2 & 3 as well as stating IP 4 Ad infinitum. Example: Poster A says 'Star Wars' Poster B says 'Firefly' Poster C says 'Batman' and posts a concept based on 'Star Wars' and 'Firefly': "One of the few survivors of Order 66 casts aside his Jedi past and doing his best to stay off the Empire's Radar, takes up the life of a smuggler. No longer seeking to do the right thing, now only looking to earn enough credits to survive." Poster D posts a concept based on 'Firefly' and 'Batman' So, to start us off I'll post the obvious one: Harry Potter.