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The "Captain Marvel" star also talks about the challenges of acting alone and without a clue what she was filming for "Avengers: Endgame."

Brie Larson is so ready to step into another epic film franchise, and she already has experience with one of the most important pieces of equipment necessary to bring it to life.

On "The Tonight Show," Jimmy Fallon challenged the "Captain Marvel" and "Avengers: Endgame" star to a game of "Beat Saber," where they have to swing virtual lightsabers at boxes and dodge obstacles to the beat of a song. It's basically like musical Jedi training meets "Rock Band."

Fallon jumped into the fray first, but also proved that he's in terrible shape for someone who plays as many games as he does. He did a pretty solid job, but it was nothing to the challenges Larson faced when she took over. Her song was infinitely more complicated than his and she absolutely nailed it.

The whole performance was incredibly fun, and the game looks like an absolute blast. But watching her dance around and masterfully wield dual lightsabers was really giving us some serious "Star Wars" vibes. Even better, we know Larson is a huge fan of the franchise, and she totally has an in.

Larson has become pretty close friends with one Samuel L. Jackson, who plays a pretty prominent role in both the Marvel Cinematic Universe and the "Star Wars" franchise.

On top of that, as she revealed during the interview, she might or might not have (but totally has) seen his actual lightsaber from when he brought Mace Windu to life during the prequel trilogy.

"He walked in and just like dropped this bag in my lap," Larson said. "I opened it and it was his lightsaber. I just immediately burst into tears. It's amazing."

After a beat, she quickly added, "I don't think he's supposed to have it; I'm not even sure I'm supposed to say that he has it. I'm sure somebody has emailed him five million times like, 'Mr. Jackson, we really need this back.' But I feel like he's got cinematic immunity in a way. He does whatever he wants."

But it kind of sounds like it absolutely belongs with Mr. Jackson, based on what Larson said is engraved on it. And there's absolutely nothing more appropriate for the lightsaber wielded by Sameul L. Jackson to have on it than the phrase "Bad Motherf--ker."

At this point, Larson made it patently clear that nothing would bring her greater joy than to flex her already-honed muscles with this new weapon. "I just have things coming out of my hands," she said of her Captain Marvel role. "Like, I need a lightsaber."

The training she just endured with Fallon's lightsabers is already more preparation than she got for her work as Captain Marvel, apparently. The actress said that due to the production time needed for "Avengers: Endgame," she had to film that before she even saw a script for the solo "Captain Marvel" movie.

And when she described the way she received script pages, we can only imagine how daunting it was to be the new kid coming into such a huge franchise with literally no idea what was going on around you at any given time. On top of that, as she's admitted in other outlets, she knew nothing about her own character or powers or anything, too.

"I arrived and they gave me a piece of paper that had-- It was a full page of dialogue and action but all of it was redacted except for my one line," she said. "I even went to hair and makeup and said, 'Who else is here?' And they're like, 'We don't know. We don't know.'"

That insane level of secrecy followed her throughout the shoot and even into post-credit scene of her solo movie, which she didn't even know she was filming as it happened.

The actress recalled shooting the scene with five other characters and she wasn't even allowed to know who she was interacting with. Instead, she filmed the scene on green screen completely by herself and had no idea what she was shooting or why.

"And then I had the pleasure of the 'Captain Marvel' premiere of seeing what the scene was and going, 'Oh, that's what that meant,'" she laughed.

It's an experience many Marvel actors are intimately familiar with, and virtually all of them just experienced at the premiere of "Avengers: Endgame." They've made no secret of the fact that none of them -- save perhaps Robert Downey, Jr. -- had seen the final film or even seemed to fully know how it played out.

Maybe they all filmed their scenes entirely by themselves in green screen and the entire film was cobbled together in post-production.

It's another piece of fantastic training for sci-fi blockbusters like this and that other Disney-owned franchise that Larson is a huge fan of. And with "Star Wars" set to move beyond the Skywalker saga after the conclusion of the current trilogy, they'll surely be looking for new heroes to wield lightsabers in future productions.

Larson just gave an impressive audition on "The Tonight Show," and her training in acting with and toward absolutely nothing in the Marvel Cinematic Universe has her fully prepared for whatever Lucasfilm could send her way. She's totally ready to join Mr. Jackson in representing the House of Mouse in both franchises.

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