Since joining Twitter last year, "X-Men: Days of Future Past" director Bryan Singer has been very active on the social media service -- especially as relates to the upcoming sequel to "X-Men: First Class." Last month, Singer posted a presumably incomplete list of the current cast, confirming Daniel Cudmore's return as Colossus and X-Men newcomers Boo Boo Stewart and Chinese actress Fan Bingbing. Today, Singer took to his Twitter feed to give an advance glimpse at Beast's new look.

"Many a monster wears the form of a man; it is better of the two to have the heart of a man & the form of a monster" twitter.com/BryanSinger/st...- Bryan Singer (@BryanSinger) April 5, 2013

The partial picture is presumably of Nicholas Hoult, who played Hank McCoy/Beast in "X-Men: First Class" and will reprise his role in "Days of Future Past." However, the blank spaces in Singer's previously revealed wall of cast actors doesn't rule out the possibility of an appearance from "X-Men: The Last Stand" alumnus Kelsey Grammer, who played the role before Hoult -- albeit, an older version of the character. Given the time-travel aspects of the "Days of Future Past" storyline, it's entirely possible that Hoult won't be the only Beast running around in the film.

"X-Men: Days of Future Past" opens July 18, 2014