Resident Evil for sure. If a 4th movie gets made...it will suck. I'd release them under the title "Biohazard" though.
Biohazard 1: Events of Resident Evil remake.
Biohazard 2: Massive; combines 2 and 3 chronologically
Biohazard 3: Code Veronica X
Biohazard 4: ****ing epic: I would try tying together the epilogues from RE3. I had a treatment scrawled in my Stats notebook...I forgot about it until I realized I tossed out the notebook.



Some things I do remember:
--Spencer's plan was to create a virus that would allow the world to evolve to the point that the weapons humans created could no longer destory it. Wesker's employers had him infiltrate Spencer's ancestral castle--similar to the one from the 3.5 build of RE4--as a double agent of theirs. I recall it began with Chris, Barry, Jill, and Carlos going to an Umbrella location to find evidence of their involvement with Raccoon City. Leon was working for Wesker.
Either Hunk or Nicholai had been sent to the crater where Raccoon had once been to investigate reports and a monster seen in the woods. The monster turned out to be Lisa Trevor. She was taken to Spencer, along with Sherry. He used Sherry, Lisa, and the viruses Wesker had to create an advanced form of the virus--Uruboros--which he intended to infect the world with, as previously stated. His plan was successful; parts of the movie would be something like a zombie apocalypse epic: zombies, lickers, gigantes, hunters, chimeras everywhere. Chris and Jill would die taking out Spencer and Wesker. The world was basically ****ed.
I took many liberties with my version of 4: basically, some of what I feel the 4th game had been in its earlier stages, mixed with some of the good from RE5.