Production on the massive X-Men: Days of Future Past has finally come to a close, and director Bryan Singer will spend the next many months in a dark editing room putting the film together.  In his return to the X-Men series, Singer assembled an enormous cast of characters, and hopes are extremely high for the time travel-infused follow-up that blends the casts of X-Men: First Class and the original X-Men films.  James McAvoy recently spoke a bit about his experience making the film, going on to say that it’s potentially “the biggest, most epic X-Men” to be brought to the screen and revealing whether his character has a scene with Patrick Stewart's older Professor X.  Hit the jump for more.

Speaking with IGN, McAvoy talked about just how enormous an undertaking the X-Men follow-up was:

“There’s an army of brilliant actors in that film. Bryan Singer is back at the helm. Potentially it’s going to be the biggest, most epic X-Men they’ve ever had. I think it’s the second biggest production Fox have ever embarked upon, behind Avatar. So they’re definitely going for it.”

McAvoy also talked about his fellow castmembers, noting that he only got to work with Patrick Stewart for one day:

“[Stewart’s] last day was my first day and that was it. Then we were done. But we did crossover and we do get a scene together… Getting to work with Michael [Fassbender] again was great. I spent a hell of a lot of time with Nick [Nicholas Hoult]. Weirdly the people that I spent the most time with acting-wise was not Michael this time, it was Hugh [Jackman] and Nick. And whilst I bemoaned the loss of my buddy Michael, it was more than made up for by the fact that Hugh and Nick are such amazing people.”

The story involves Jackman’s Wolverine being sent to the past to prevent a post-apocalyptic future, but it’s interesting that Hoult’s Beast also appears to play a major role in the film.  One imagines Fassbender’s Magneto was kept company by Jennifer Lawrence’s Mystique.  X-Men: Days of Future Past opens in theaters on May 23, 2014.