'X-Men: Days of Future Past' is going to be one hell of an 'X-Men' movie, melding together the original mutants, like Patrick Stewart and Hugh Jackman, with the updated 'First Class' cast. Now 'Game of Thrones' star Peter Dinklage is the first newbie added to the franchise in a previously unknown role, but the first details of his character have leaked out!

It was only the other day that Peter Dinklage, mostly known for his role as the highly popular Tyrion Lannister in HBO's 'Game of Thrones,' was welcomed into the 'X-Men: Days of Future Past' cast by Bryan Singer, and now we know, thanks to Variety, his character will be that of the film's "main antagonist."

UPDATE: Based on a tip from an anonymous source, MTV Geek is reporting that Dinklage's 'X-Men: Days of Future Past' role will be none other than Bolivar Trask. In the event that this information turns out to be unreliable, continue reading the rest of the original article for other speculations.

However, details are still muddled as to which villain exactly he'll assume, but the fanboys have already begun speculation. The primary candidate is that of Doctor Bolivar Trask, known in the comic book series as the creator of the Sentinels, but there's a couple things to keep in mind. Actor Bill Duke portrayed this same character in 'X-Men: The Last Stand,' and although this doesn't guarantee his return by any means, Singer has said that 'Days of Future Past' will incorporate the entire movie storyline in some way.

If Trask is not an option, there are a ton of characters in the comics Dinklage could end up playing, like Nimrod (the ultimate Sentinel sent from an alternate timeline to destroy the X-Men) or Master Mold (the most sentient of all the Sentinels built by Trask to create the robot army). Though if any of these roles are up for filling, that means he'd be voicing something CGI-d and that would just be a waste of the man's talent.

Then, of course, we can dive even deeper and consider some more alternate timeline-type characters. Clearly we have our own speculations, but what do you think? All you 'X-Men' enthusiasts out there, give us your theories on which comic book villain Peter Dinklage could portray.