A direct sequel to 2011's X-Men: First Class, the X-Men: Days of Future Past is an upcoming 2014 American superhero film based on the fictional X-Men characters made popular created by Marvel comics.

Directed by Bryan Singer, the movie is set for released in 2D and 3D theaters May 21, 2014 in various international markets, and will premiere May 23, 2014 in the U.S.

X-Men: Days of Future Past is the seventh film in the X-Men film series and the third X-Men film directed by Singer. The cast of this movie features well-loved characters from the original trilogy of X-Men Films and the prequel X-Men: First Class.

The movie stars an ensemble cast, including Hugh Jackman as Wolverine who will be sent to play his younger self in the past, James McAvoy and Patrick Stewart as Charles Xavier/Professor X, Michael Fassbender and Ian Mckellen as Eric Lehnsherr/Magneto, Jennifer Lawrence as Raven Darkholme/Mystique, Helle Berry as Ororo Munroe/Storm, Anna Paquin as Marie/Rogue Shawn Ashmore as Bobby Drake/Iceman, Ellen Page as Kitty Pryde and new comer Peter Dinklage as Bolivar Trask.

As one of the most famous X-Men stories of all time, Days of Future Past originally appeared in 1981's Uncanny X-Men as it features a bleak alternate future where most of the X-Men are dead. During this time mutants are hunted even worse than what's happening in the present lives of the X-Men.

The chaos started when the X-Men's younger version failed to stop the Brotherhood of Evil Mutants led by Mystique where they killed the anti-mutant Sen. Robert Kelly. The murder caused all sorts of problems that prompted the adult Kitty Pryde to travel back time to warn the X-Men about the consequences of the assassination.

Since time traveling is a vital part of the story, Singer consulted renowned Director James Cameron about his upcoming movie.

"You have to create your rules and stick with them," Singer told the UK film magazine.

"That's why Terminator and Back To The Future work so well. And there are certain mechanisms in X-Men, certain powers, perceptions and characters that make this possible."