The finale of Ms. Marvel brought Kamala Khan’s origin story to its dramatic conclusion, but also dropped a huge revelation that’s bound to shape the future of the MCU.

MAJOR SPOILERS FOR THE MS. MARVEL FINALE FOLLOW!

In the comics, Ms. Marvel has an Inhuman gene, which is the source of her powers. In the MCU, as has been known since the character’s Disney Plus series was announced, this is not the case. Now, the finale has revealed the true source of Kamala Khan’s powers: she’s a mutant.

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While Iman Vellani’s Kamala is not the first mutant to appear in an MCU project, she is the first mutant in the MCU’s primary 616 universe and the first character in the MCU to be referred to as a mutant. The reveal appears to signal the coming of the X-Men.

Ms. Marvel & The X-Men

In the Ms. Marvel finale’s closing moments, Matt Lintz’s Bruno Carrelli tells Kamala that he’s taken another look at her genetic makeup and discovered something “different” about her, suggesting this was the reason her great-grandmother’s bangle was able to activate powers within her.

Bruno tells Kamala that he’s discovered a “mutation” in her genes. When he drops this revelation, as if to dispel any doubts over the word’s significance, the X-Men animated series’ theme plays.

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Ms. Marvel head writer Bisha K. Ali said “Oh my god, best day of my life!” when discussing the reveal on Marvel.com. She went on to reveal the idea of Kamala becoming a mutant came up as an answer to the question of why she has powers when the rest of her family do not:

“It wasn’t from the beginning [of the show]. With Marvel, something’s always a moving piece, and we’re trying to solve this question of, ‘If any of [Kamala’s family] put the bangle on, would they have powers?’ The answer was always no, from a character perspective, no.”

Ali said that making Kamala Khan a mutant also “fit into the logic of the wider MCU.” This could be taken as an indication that more mutants are well and truly on the way.

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This wasn’t the season finale’s only major reveal, though. It wouldn’t be an MCU series without a post-credits scene. With Iman Vellani set to return as Kamala Khan in The Marvels, the finale’s mid-credits tease saw Kamala suddenly vanishing from her bedroom, only to be replaced by a very confused Captain Marvel (Brie Larson).

Whatever’s going on here will surely become more apparent when The Marvels arrives in theaters next year. The film will see the two heroes cross paths, along with Teyonah Parris’ Monica Rambeau.

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Here is the synopsis for Ms. Marvel:

Marvel Studios’ “Ms. Marvel” is a new, original series that introduces Kamala Khan, a Muslim American teenager growing up in Jersey City. An avid gamer and a voracious fan-fiction scribe, Kamala is a Super Hero mega fan with an oversized imagination—particularly when it comes to Captain Marvel. Yet Kamala feels like she doesn’t fit in at school and sometimes even at home—that is, until she gets super powers like the heroes she’s always looked up to. Life gets better with super powers, right?

The series stars Iman Vellani, Aramis Knight, Saagar Shaikh, Rish Shah, Matt Lintz, Zenobia Shroff, Mohan Kapur, Fawad Khan, Mehwish Hayat, and Farhan Akhtar. Episodes of the series were directed by Adil El Arbi & Bilall Fallah, Meera Menon, and Sharmeen Obaid-Chinoy, with Bisha K. Ali serving as the head writer. Marvel’s Kevin Feige is involved in the series as an executive producer.

Ms. Marvel is now streaming on Disney Plus. Stay tuned for all the latest news surrounding the Disney Plus series, and subscribe to our YouTube channel for more original video content.