[Warning! Potential SPOILERS!]

Fox has been ramping up the PR campaign around X-Men: Days of Future Past, its wildly ambitious, hugely expensive installment of its ongoing X-Men movie universe. Directed by Bryan Singer, who helmed the first two X-Men films and helped modernize the superhero blockbuster, DoFP features the cast of the three “present-day” X-movies alongside the younger cast of X-Men: First Class.

As we await the film’s second full-length trailer – teased by two different previews – we can amuse ourselves by counting the sheer number of mutant characters. We’ve got at least 25 characters in the principle cast alone, but Fox and Singer may yet have some surprises in store.

We’ve already theorized that the fractured-timeline nature of the plot – set partially in a dystopian future where mutants are hunted down and exterminated by giant killer robots called Sentinels and partially in the post-First Class 1960s and 70s – could be utilized to trim the sheer number of characters in this universe, which keeps expanding.

X Men Days of Future Past Hugh Jackman Michael Fassbender Nicholas Hoult 70s Another X Men: Days of Future Past Cameo Revealed? [Spoilers]

Younger versions of Toad (Evan Jonigkeit) and William Stryker (John Helman) are joined by Blink (Bingbing Fan), Warpath (Booboo Stewart), Sunspot (Adan Canto) and Bishop (Omar Sy), and Evan Peters as Quicksilver. With all the new mutants to keep track of – along with nearly the entire cast of the original films and First Class, lest we forget – is there any room for a few more familiar faces?

According to a new report, there just may be. The news may contain some SPOILERS for Days of Future Past, so if you’d rather not know, turn back now.

Otherwise, click to the next page to find out who it is!

Kelsey Grammer as the Beast in X Men The Last Stand Another X Men: Days of Future Past Cameo Revealed? [Spoilers]

According to ShowbizSpy, Kelsey Grammer has shot a secret cameo for Days of Future Past as Dr. Hank McCoy, A.K.A. Beast, the classic X-Men character he originated in director Brett Ratner’s 2006 X-Men: The Last Stand, and who was subsequently played as a youngster in First Class by Nicholas Hoult.

According to “an insider” on the film:

“Producers had the brilliant idea to bring back Kelsey for Days of Future Past. It wasn’t hard to get him to sign on for a guest appearance. He jumped at the opportunity the second it was brought to his attention.”

The previous trailer and previews have centered on an older Wolverine (Hugh Jackman), whose consciousness is sent back in time by Kitty Pryde (Ellen Page) at the behest of Professor Xavier (Patrick Stewart) and Magneto (Ian McKellen) to change history. This potentially leaves room for a whole host of timeline-altering possibilities (which is apparently one of the movie’s goals), but where would the older Beast fit in?

This anonymous source has an answer: “Kelsey will appear as an alternate adult Beast toward the end of the film.” As for when Grammer shot his appearance:

“Kelsey’s special cameo was secretly shot during post-production on the Fox lot under the impression that Kelsey would be on set to film a pilot for a different project.”

X Men Movies Beast Comparison Hoult Grammer 1024x682 Another X Men: Days of Future Past Cameo Revealed? [Spoilers]

As always, take this with several tons of salt… but it makes a certain amount of sense, if true. Grammer’s performance was a standout in a film that is largely derided by fans, and his character has undergone a number of transformations in the comics.

Speaking of transformations, one curious aspect of much of DoFP‘s promotional material has been the way that Hoult’s Beast is sometimes seen in full blue, furry mode as well as his human form. Last month, Hoult explained to JoBlo:

What’s happened up to this point is between the time of the last movie and this movie my character has created a serum which basically controls his mutation so his appearance is normal as long as he doesn’t get worked up.  Any animal instinct or urges, that kind of brings him out.

This begs the question of what form Grammer’s Beast will take. If his cameo (if real) ends up in the movie, and he truly comes in only at the end, he may have a bigger role to play in X-Men: Apocalypse, with plans to feature him in later films – perhaps even Wolverine 3. As always, stay tuned for more details as they become available.

X-Men: Days of Future Past will open in U.S. theaters on May 23rd, 2014.

Source: ShowbizSpy