The latest trailer of the upcoming 2016 superhero movie "X Men: Apocalypse", based on the Marvel comic books of the same name, has been leaked online before the scheduled date.

The trailer showcases various mutants, including Professor Xavier's X Men, and their struggle to fight the oldest and most powerful mutant of all times: the immortal Apocalypse.

In the trailer, Apocalypse is shown as a monstrous beast that has a gigantic appearance. He emerges from the dark, saying, "I have called many things over many lifetimes... Ram, Krishna, Yahweh..."

 Though there are no direct hints, it seems Apocalypse might act as the messenger of Galactus — a demigod who controls the universe.

Galactus has appeared in a number of Marvel comic books and was vaguely shown in the live action movie "Fantastic Four: Rise of the Silver Surfer". He is one of the archenemies of a number of Marvel heroes including the Fantastic Four, Avengers, Spider-Man and SHIELD.

Given that the crossover between Marvel Cinematic Universe has been a huge success, there may be a possibility that the characters of "X Men: Apocalypse" may join the other cast for the next Avengers movie titled "Avengers: Infinity War."

It will be an ultimate showdown if Apocalypse and Thanos unite and fight the Avengers. Though there has been no official confirmation yet, the cast of X Men might join the Avengers.

"X Men: Apocalypse" will be a sequel to 2014's "X Men: Days of Future Past". Directed by Bryan Singer, the film features an ensemble cast of James McAvoy, Michael Fassbender, Jennifer Lawrence, Oscar Isaac, Nicholas Hoult, Rose Byrne, Olivia Munn, Evan Peters, Kodi Smit-McPhee, Sophie Turner, Tye Sheridan, Alexandra Shipp, Lucas Till, Josh Helman, Lana Condor and Ben Hardy.

The film will complete Bryan Singer's "X Men: First Class" trilogy and will be ninth installment in the entire "X Men" film series.

"X Men Apocalypse" is all set to hit the theatres in traditional and IMAX formats around the globe on 27 May, 2016.