So, Viper (Madame Hydra) is now officially a part of Fox's X-Men universe...
But how is this possible since her character is pretty well attached to the Hydra organization, which is a part of the MCU?
Well, the answer may lie in some things Kevin Feige said about the use of the Skrulls and Scarlet Witch and Quicksilver by Marvel Studios...
Are the rights to the Skrulls with another studio?
Feige: Yes, Skrulls have a big connection to Fantastic Four. So there are some contractual limitations about who can do what when it comes to Skrulls. Though that is not why we didn’t do Skrulls. There is already enough going on in this movie.
In a separate interview at the premiere with Hey U Guys, he was asked about the rights status of Scarlet Witch and Quicksilver, Marvel mutants who served as early members of the Avengers, and revealed that, “It’s a little complicated, but if they [Fox, which holds the X-Men rights] want to use them in the X-Men movie they could, [but] if we want to use them in The Avengers movie, we could.
This implies that there may be gray areas in terms of who can use what characters, and even means that some characters can be used by both Marvel Studios and other studios simultaneously.
Does this mean we could see two separate versions of Viper on the big screen, one in Fox's X-Men universe and one in the MCU (even in Captain America: The Winder Soldier)? Perhaps...