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Doomsday tradition, the latest teaser trailer has leaked online ahead of its release in theaters, revealing an unlikely teamup in the process.

Marvel recently released the third trailer for Avengers: Doomsday, and unlike the first two, which bring back older characters of the MCU, this one brings back characters fans had always hoped would be part of the franchise. The X-Men are officially making their grand entrance.

The third teaser for “ Avengers: Doomsday ,” which has been playing in front of “Avatar: Fire and Ash” screenings, has been released online, and it marks the return of Fox’s “X-Men” characters Prof. Charles Xavier ( Patrick Stewart ), Magneto ( Ian McKellen) and Cyclops ( James Marsden ).

Although the main story of Marvel Ultimate Alliance 3 is about Thanos trying to engulf the world in another peril, the Black Order expansion of the 2019 action role-playing game is centred on Doctor Doom and the Fantastic Four.

The Wakandans and the Fantastic Four join forces against Robert Downey Jr.'s Doctor Doom in leaked teaser of Avengers: Doomsday.

Avengers: Doomsday is still nearly a year away, but if you want to do a Marvel movies rewatch ahead of its release, you really need to start now.