Third Dark Lord, or Melkor's Return?

[Morthoron]

Originally Posted by Barrel-rider

Well, a new body would make him at least for a while unrecognizable.

Hmmm...Sauron may have been able to fool a few Noldor with his Annatar glam look, but the more percipient Elves figured him out, or at least got such a bad vibe as to turn him away. But if we're talking about the Valar and Maiar, I don't think Morgoth would hoodwink any of them. Besides, if I recollect correctly, I think Morgoth had expended so much of his energy into corrupting Arda that he was no longer able to disguise what he'd become.