Originally Posted by The Epic Beyond
The Sentry would work in an avengers sequel maybe playing off the original mini series. Make it a mystery playing off how nobody remembers him and they should and it turns out he's the villain in the end.
As far as characters that would never make it to film Maggot from the X-men
Nope, still wouldn't work. The Sentry mini relies upon the dystopian nature of the Marvel Universe, a dystopian nature that simply hasn't been present in the movies to date.