As hinted at in an interview with Joss Whedon last week, EW says that an unnamed source has confirmed that Scarlet Witch and Quicksilver will be assembling alongside Earth’s mightiest heroes when Marvel’s The Avengers 2 hits the big screen in 2015.

Marvel Studios President Kevin Feige previously revealed that rights allow for the mutant siblings to appear in both the Marvel cinematic universe and in 20th Century Fox’s X-Men universe.

“We both have them,” Feige told SuperHeroHype last summer. “There’s a specific arrangement with those two characters that would allow us to use them with ‘Avengers,’ but not discuss or reference their mutant or Magneto-related lineage. They can use them as mutants and as Magneto’s relatives, but cannot have anything to do with ‘The Avengers’.”

Regardless of who ultimately assembles for the sequel, Marvel’s The Avengers 2 hits the big screen May 1, 2015.