The next Avengers movie the Age of Ultron introduces two new members of the team. The Scarlet Witch and Quicksilver were members of the second phase of the team and it makes sense to add them at this point. One issue that is going to arise with both of these characters is simple: how did they get their powers? Marvel cannot use the origin of Scarlet Witch and Quicksilver because both were mutants. Marvel Studios does not own the movie rights to the terminology mutant because that went with the rights to the X-Men and Fox. So without the rights to such terminology, how will the writers explain the powers of the Maximoff twins?
One possibility that has been rumored is that Marvel will introduce the concept of inhumanity. It sounds more than a little strange and might be somewhat confusing but it does make sense from a Marvel Universe standpoint. The Inhumans were another team of super powered heroes similar to the Avengers but are born with their various abilities.
Inhumanity could essentially work exactly like the terminology mutant. Inhumans would have an additional gene or some other factor that makes them develop special abilities. Mutants have the X-Gene that allows them to develop powers and abilities. There would need to be some minimal explanation but the term would be easy to include and the concept would stick. Inhumanity could develop a whole series of additional characters and become another genre of the Marvel Universe.
Quicksilver and the Scarlet Witch both have additional ties to the Inhumans. Quicksilver will eventually marry a member of the Inhumans and the Scarlet Witch will need their assistance at various times. The connection could be developed into a number of future story lines that could be used in the movies. How the movie will explain the powers of the Scarlet Witch and Quicksilver is still unknown but the inhumanity concept seems to fit well into most story lines.
There could also be an entire Inhumans story line developed for spin off films. Marvel seems to be capitalizing on connections within their universe. This could be an opportunity to develop another brand within the movie franchise much like what the studio is doing with Guardians of the Galaxy. Could there be an Inhumans movie in the future for Marvel phase four?
The Scarlet Witch and Quicksilver will become important members of the Avengers and assist the team in numerous ways. The speculation about inhumanity will be revealed in Avengers Age of Ultron. The movie is released on May 1 2015 in the United States.