Source: comicbook.com

6. The Leader

Samuel Sterns was a scientist waaaaayyyyyy back in The Incredible Hulk (2008). He used the online handle Mr. Blue to communicate with Bruce Banner, who was Mr. Green (Get it? Lol.). But when Bruce eventually found Samuel, it became clear that the scientist did not exactly want to help out.

No, he wanted to see what made the Hulk tick, and maybe take advantage of it a bit. That"¦That did not go so well for him. He got smacked around and gained one hell of an open head wound. And then some Hulk juice landed in it, and his head started to grow and mutate and…We never saw him again.

Look, I know it's a longshot, but the dude is out there, ripe for the picking for any writer who wants him.