First things first: that cute little girl you see above sitting on Quicksilver's lap in a scene from 'X-Men: Days of Future Past' is not Scarlet Witch. When that image was first revealed, fans immediately began speculating that the little girl was a version of Wanda Maximoff, but director Bryan Singer has confirmed that's not her, while adding that Scarlet Witch almost was in the movie.

Quicksilver and Scarlet Witch are two of the rare Marvel characters that can appear in multiple universes due to complicated rights issues. While both characters are a big part of 'Avengers 2,' only Quicksilver appears in 'X-Men: Days of Future Past,' though Singer told Empire Magazine (via Comic Book) that Wanda's presence was almost felt:

I had a line which I cut, where Quicksilver’s mother says to the little girl, 'Go up and bug your sister,' and the little girl says, 'She bugs me!' You never see the older sister, but it was to imply that there is an older sister for comic book fans. I ended up cutting it.

The mention would've been setting the stage for both Quicksilver and Scarlet Witch to team in any 'X-Men' sequel as Singer admits that the idea of the twins working together is something he'd "like to explore further" in 'X-Men: Apocalypse.'

While in 'Avengers 2,' they're not allowed to refer to Quicksilver or Scarlet Witch as mutants, that's not an issue in the 'X-Men' world and it's possible they could eventually reveal that, as in the comic books, Magneto is their father. Given the age of the characters, that might not work out, but it will be interesting to see how large a part they play in the future of the franchise. Despite his frequent presence in the trailers and clips, Quicksilver has a minor role in 'X-Men: Days of Future Past' (coincidentally, helping Wolverine and Professor X break Magneto out of jail).

'X-Men: Days of Future Past' opens in theaters on May 23.

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