"X-Men: Days of Future Past" will combine new mutants with old ones, as Bryan Singer has officially announced the return of Patrick Stewart and Ian McKellen to the Marvel franchise. And that's not all: Singer teased that there's "more to come" as far as big casting news is concerned.
Clearly, it's not just the returning "First Class" players like James McAvoy and Michael Fassbender that Singer is bringing into the fold. He's looking into his own "X-Men" past for some new (old?) recruits. Assuming that Stewart and McKellen aren't the last of the old "X-Men" guard to be asked back, then, we're left to wonder… who else from the original trilogy deserves a spot on the "Days of Future Past" roster? Read on to see our list!