4. Chucky Vs The Puppet Master
Admittedly, this would probably make for a pretty shoddy story, but it's all about the visuals in this case. Imagining Chucky wading through the likes of Blade, Jester, Pinhead and Shredder Khan is a pretty cool prospect. How any scriptwriter could interweave the plots to make them crossover in any meaningful way is anyone's guess. I imagine it would have to be as ridiculous as the plot for 'Freddy Vs Jason' which was, quite frankly, utter nonsense.