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Captain Marvelwas the first time we saw Captain Marvel. But it wasn't Brie Larson's first time playing her.

Because Avengers: Endgameshot back-to-back with Avengers: Infinity War8 U.S.C 2257 it was completed before Captain Marvelbegan production -- which meant that figuring out who Captain Marvel would be in their movie required a bit of outside help.

"A lot of it was working with [Ryan] Fleck and [Anna] Boden as they were developing [Captain Marvel]," Joe told Mashable of creating Captain Marvel for Endgame.

"As far as Marvel is a relay race where people are handing the baton off to each other, that was as collaborative an effort as we’ve had introducing a new character," he continued. "Whereas with Black Panther and Spider-Man, we were making those choices exclusively because there were no future films in the works yet."

Larson, for her part, seems to have fond memories of the process. "I had to stumble and figure out who this character was, with no script for this and no script for Captain Marveleither, and perform for the first time in front of legends," she said at the Endgamepress conference. "But it was incredible."

Even with all that communication and collaboration, fans have already picked up on the fact that the Captain Marvel of Endgamelooks a little different from the Captain Marvel of Captain Marvel. Specifically, she looks more made up.

Some fans wondered if this might be a case of male directors failing to understand a female character, or a studio imposing a more glammed-up look for one of their marquee heroes.

Not so, says Joe. According to him, Captain Marvel's Endgameblowout and darker lip were Larson's idea.

"I think she was experimenting with what the character was. And those were the choices that she and her hair and makeup team had made," he said to /Film. "And I think as she started to gain a deeper understanding of the character, especially as she approached her own movie, she started to make different choices."

Okay, sure -- that makes sense from a filmmaking standpoint. But seeing as decades have passed between Captain Marveland Avengers: Endgame, might there be some story reason for the makeover?

Unsurprisingly, the Russos aren't saying. Asked how Captain Marvel might be different in Endgame, Joe declined to answer. "That gets too specific to what her story is in the movie."