Re: What villains are left for a 4th film?
Hmmm...I'm sure with all their tentaclely goodness the Quintessons would be a good villain if you pair them up with Unicron.
"Now I am become death, the destroyer of worlds."
- Just because you have that power doesn't mean you should use it.
- Always remember you aren't as great as all those people tell you you are.