Re: Is Viper an official X-men villain?
Viper is in this movie because she plays a part in the story they are adapting.
She'd not a random addition.
James McAvoy | Michael Fassbender | Jennifer Lawrence | Nicholas Hoult | Peter Dinklage
X-Men: Days of Future Past
Patrick Stewart | Ian McKellen | Anna Paquin | Ellen Page | Shawn Ashmore | and Hugh Jackman
Omar Sy | Fan Bingbing | Booboo Stewart