While the main villain in Joss Whedon’s The Avengers: Age of Ultron might be easy to figure out (Hint: It’s in the title.), a new report has a secondary villain showing up to test the superhero team. We’ll keep the identity of that villain until after the jump, but for a teaser, the character is rumored to be tied in with newcomers Quicksilver (Aaron Taylor-Johnson) and Scarlet Witch (Elizabeth Olsen) in some fashion.

The film also stars Robert Downey Jr., Chris Evans, Chris Hemsworth, Mark Ruffalo, Scarlett Johansson, Cobie Smulders, Samuel L. Jackson, and James Spader. The Avengers: Age of Ultron opens May 1, 2015. Hit the jump for more, including all manner of possible spoilers.

The rumor of a new villain in The Avengers: Age of Ultron was first reported by Latino-Review, and apparently further supported by HitFix. So which villain will be joining the fray in the Marvel sequel? Why, it’s Baron Wolfgang Von Strucker! If that name means little or nothing to you, here’s a bit on his backstory: A former Nazi soldier and one of H.Y.D.R.A.’s leaders, Strucker has been physically augmented to the point of achieving near invulnerability and an impressive healing factor that allows him to cheat death time and again. (For those of you still trying to suss out Agent Coulson’s (Clark Gregg) return, just know that Strucker was also a Life Model Decoy on a couple of occasions.)

That’s all well and good, but how does Strucker fit into the story? According to both reports, the Nazi nasty will be responsible for bringing both Quicksilver and Scarlet Witch into the fray, and it seems that the new characters are actually on his side, at least at the outset. If it turns out to be true, that could make for an interesting arc to see how/when/if the siblings are invited into The Avengers‘ fold.

As for casting, Latino-Review reports that Marvel is looking for a “PHYSICALLY IMPOSING MAN, age range 40-50, Caucasian, for a supporting role” and has eyed both Dougray Scott (Mission: Impossible II) and Marton Csokas (The Lord of the Rings: Return of the King). They’re also quick to point out that neither actor is officially in the film yet and may not have even received an offer. There’s likely much more to come over the next … year and a half before The Avengers: Age of Ultron debuts, so stay tuned.