Joe and Anthony Russo recently joked that they have as many as 67 characters they're looking to squeeze into the two-part Avengers: Infinity War. While that may be something of an exaggeration, it's easy to believe that Kevin Feige has given them a very long list of all the new heroes and villains who need to be included in some way as the story which kicked off back in 2012 reaches its conclusion. So expect Phase 3 to not only bring back old favourites, but a lot of new characters as well. Whether we're talking about future Avengers who will be introduced in that epic two-parter or villains set to factor into the many other Phase 3 releases which are coming out before then, it's inevitable that the Marvel Cinematic Universe is going to expand in a major way over the next few years (especially as the studio launches several new franchises based around characters like Black Panther and Spider-Man). Here are the twenty comic book characters who desperately need to make their debut in this world, whether it's as part of Infinity War, one of the many solo movies on the way, or on the rapidly growing small screen side of the MCU on Netflix...
