In the early 2000s, Marvel Entertainment had big plans for its characters on screen. After staving off bankruptcy, Blade, X-Men, and Spider-Man had all been hits for the company, and a number of projects were in development around that time which would have eventually joined them.
One Twitter user recently came across a slate announcement from the pre-Marvel Studios days, and it sure does make for interesting reading.
While some of the movies here did see the light of day, there are many that didn't. Man-Thing, a 2005 Iron Man movie, and Namor are among them, and we see there were once plans in place for the likes of Silver Surfer, Fury, Captain America, and Deathlok. A couple of those would evolve into Marvel Studios projects, but some of these characters still haven't appeared in their own movies.
Man-Thing has yet to be utilized, while there's still no sign of Namor the Submariner. Deathlok made a forgettable appearance in Agents of S.H.I.E.L.D., of course, but Silver Surfer has been on the shelf since appearing in 2007's Fantastic Four: Rise of the Silver Surfer.
Hopefully, we'll see these characters in the MCU at some point, as Captain America, Iron Man, and Nick Fury ended up doing pretty well after their movies failed to materials the first time around!