The X-Men are coming back to join 'Avengers: Doomsday'!

This is not a drill: The X-Men are making a comeback for "Avengers: Doomsday!"

In the latest teaser for the upcoming film, Marvel brings back the OGs: Patrick Stewart's Professor X, Ian McKellen's Magneto, and James Marsden's Cyclops.

Professor X and Magneto are shown playing chess and grasping hands at the iconic Xavier's School for Gifted Youngsters, while Cyclops is shown unleashing a powerful blast of his lasers in rage.

Fans couldn't help but get emotional at seeing the original cast together, 26 years since since first-ever "X-Men" film.

"Patrick Stewart and Ian McKellen together one last time as Professor X and Magneto is enough to bring a tear to the eye," a comment said. "A lot of us grew up with their versions of the characters."

Another fan added, "Awesome to James Marsden as Cyclops again. He’s perfect for that role. It’s just him. He owns it. Like the other cast and their characters. You just can’t picture anyone else."

In its previous "Avengers: Doomsday" teasers, Marvel revealed that Chris Evans' Captain America and Chris Hemsworth's Thor are returning for the movie.

In the star-studded "Avengers: Doomsday," Robert Downey Jr. playing Doctor Doom. The film will premiere on December 18. —JCB, GMA Integrated News