here's a few suggestions:
1. all the mcr guys stay in a cabin in the woods, home to a young, female murderer
2. a musical thing (you know like glee but real life... i know i'm crazy)
3. mikey is an young boy who wants to seek revenge on all the bullies that tormented him so he goes on a killing rampage
4. battle of the bands between mcr and this other band and gerard falls in love with the competition
5. frank is the new guy in town, so what happens when one of his new friends turns out to be a psychopath
sorry if these ideas suck but here you go :)