The Marvel Cinematic Universe has delivered plenty of jaw-dropping over the past 11 years, some of which were drawn directly from the comic book source material. Two teams of Avengers charging toward each other in the midst of a civil war, and Thanos wiping out half of life in the universe with the snap of his fingers leap immediately to mind. However, there's an iconic Avengers moment that has yet to be immortalized on the big screen: Captain America rallying the team with a cry of "Avengers assemble!"

The line has been been teased before, but if there's ever a time for it to happen, it's in Avengers: Endgame.

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When the situation is dire in the comics, the Avengers typically band together for an epic full-page moment when Captain America calls for them to assemble. It's not merely a battle cry; it's a signal that Earth's Mightiest Heroes stand as one.

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It certainly seemed as if we might get that moment in 2012's The Avengers, when the team came together for the first time to stop the invasion of Earth by Loki and his Chitauri allies. The film instead opted for a "show, don't tell" approach, with a 360-degree shot of the assembled heroes at the Battle of New York.

Avengers: Age of Ultron went a bit further, by having Steve Rogers begin to say the line when the new team banded together at the end of the 2015 sequel. However, he was cut off by the credits. The gag worked, but it left fans begging to hear the full line. However, because the Avengers spent most of Infinity War scattered across the globe, and the galaxy, there was little opportunity for Steve, or anyone, to rally the team.

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The conclusion of the story that begin in 2008's Iron Man, Endgame is also the final film starring some of the original Avengers. There's never going to be another opportunity like this for Chris Evans' Steve Rogers, or Robert Downey Jr.'s Tony Stark for that matter, to yell, "Avengers assemble!"

The odds are stacked against the remaining Avengers and their allies, and they are willing to do "whatever it takes" to save their fallen friends, and the universe. Knowing the film is a final chapter for some of our favorite heroes, seeing this epic moment come to life would not only have cheering audiences on their feet, it would undoubtedly deliver an emotional gut-punch.

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It's now or never. If ever there was a film to do it, it's Endgame.

Directed by Anthony and Joe Russo, Avengers: Endgame stars Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Don Cheadle, Paul Rudd, Brie Larson, Karen Gillan, Danai Gurira, Benedict Wong, Jon Favreau and Bradley Cooper, with Gwyneth Paltrow and Josh Brolin. The film arrives April 26.