After Thanos (Josh Brolin) is defeated, his snap having been undone, Captain America (Chris Evans) travels back in time to place the Infinity Stones in their proper place, back to where they were before the Endgame characters borrowed them for their mission. But Cap decides to change his destiny. He lives out his life in the past and marries Peggy Carter (Hayley Atwell). Rather than returning as the Steve Rogers his friends knew, he shows up in the present as an old man. He then passes the title and responsibility of Captain America off to Mackie's Sam Wilson, aka Falcon.

The only thing better than that ending, was how Mackie said he learned about it.

In a recent interview with IMDb, the actor revealed that before shooting, he had not seen the Endgame scripted ending, and it was actually Evans who informed his friend and co-star that his character would be taking over the mantle of Captain America.

"We were at his house and he goes, 'You excited?' And I go, 'What are you talking about?' and he goes, 'You don't know?' He jumps up, runs out of the room and comes back in with the script," Mackie said.

After reading the ending, Mackie was blown away, the actor admitted.

"We cried. We drank. We laughed," he said of the evening. "I am very happy I got that moment with Chris, for him to not only pass me the shield, but to tell me it was happening."

Evans and Mackie first worked together as Cap and Falcon in 2014's Captain America: The Winter Soldier, which was also directed by Endgame filmmakers The Russo Bros.

"We're catching Steve at the end of the life he wanted to live," Mackie said of Rogers getting to spend his life with true love Peggy Carter. "He found that happiness that Tony [Stark, played by Robert Downey Jr.] was telling him about."

The emotional weight of taking that shield meant a lot, Mackie said.

"It means a lot to me for my sons to see Captain America as a black dude and for me to be that dude to my sons," he said. "So that moment was not just, 'Hey, we're acting.' It was more of a thing. And then they cut and I cried. And Chris cried. And the Russos cried. And everyone cried. It was an emotional day."

Mackie is set to co-star with Sebastian Stan in a Disney+ series called Falcon & Winter Soldier, which presumably could bridge the gap between Endgame and any future Captain America installments with Mackie as the lead.

Watch the entire interview, below.