The new 'Avengers: Endgame' teaser shows Tony and Steve reuniting for the first time since 'Civil War,' and fans are losing it

• Iron Man and Captain America are reunited in Marvel's "Avengers: Endgame." 
• The two haven't been together since the events of 2016's "Captain America: Civil War." 
• Fans are excited about the two men working together again. 
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Tony Stark and Steve Rogers are back together in a new teaser for "Avengers: Endgame," and fans are freaking out over this long-awaited reunion.

In one scene, Stark (Iron Man) asks Rogers (Captain America), "Do you trust me?" 

"I do," Rogers responds as the two men shake hands. 

Read more: Thanos faces some angry Avengers in new 'Endgame' teaser

The reunion is making Marvel fans emotional. 

The last time Stark and Rogers were shown together was in 2016's "Captain America: Civil War." The two fought against each other and divided the team over a disagreement on how the government should treat the Avengers. 

In "Civil War," Stark also learns that Bucky killed his parents and that Rogers knew. 

Co-director Anthony Russo told Fandango that Stark and Tony's "severed" relationship played into what happened in "Infinity War." 

"The relationship between Tony Stark and Steve Rogers was severed, and that was what put them in a vulnerable place when Thanos came in 'Infinity War,' and I think is partially what led to their demise in that film, the fact that they were divided when the greatest threat they ever faced came to them," he said. "So there is definitely a throughline there."

The two were almost reunited in "Avengers: Infinity War," but the writers and directors decided against it. 

In commentary from the "Infinity War" DVD, co-director Joe Russo and co-writer Stephen McFeely explained why Stark and Rogers couldn't work together in the movie.

"Now, what's interesting about these characters is that they are all heroes, and that, irrespective of the events of 'Civil War,' and the fact that they caused physical damage to Rhodey, when aliens show up with the intent to destroy the Earth, [Steve] does not hesitate, as a hero, to invite in other heroes who can help him defend the planet," Russo said. "And I think it will be a much different situation if Tony were here. If Tony and Steve had to see each other for the first time, it would be much more complicated."

McFeely added: "Which is why we didn't do it. We tried in a few drafts and it ground things to a halt."

Instead, Bruce Banner ends up calling Rogers in for help against Thanos, and Stark goes to space with Doctor Strange and Spider-Man. 

There is one theory that present-day Stark travels back and meets a past version of Captain America, which is what the scene could represent. In leaked photos from the set, Captain America is seen in an older suit next to Stark. 

However, in the "Endgame" teaser, both Stark and Rogers are shown along with the remaining Avengers as they attempt to destroy Thanos and reverse the events of "Infinity War," so they definitely do reunite at some point. 

"Avengers: Endgame" will be released in theaters on Friday, April 26.

• Read more about "Avengers: Endgame":
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• 'Avengers: Endgame' released 32 posters that each highlight a superhero, including the fallen characters from 'Infinity War'
• Here are all the Marvel movies referenced in the newest 'Avengers: Endgame' trailer

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