Marvel’s What If…? Season 3 Trailer Teases Storm with Mjolnir, New Characters, and X-Men Crossovers.

The Marvel Cinematic Universe is expanding its animated reach even further with What If…? Season 3, set to premiere on Disney+ on December 22, 2025. The new season’s trailer packs a punch, featuring exciting new Variants and surprising characters that set the stage for a thrilling multiverse ride. For the first time in the MCU, an X-Men character, Storm, will wield Mjolnir and cross paths with other Marvel characters. With characters like White Vision, Agatha Harkness, and even multiple Watchers, What If…? Season 3 promises to bring the Marvel multiverse to new, fascinating dimensions.

Season 2 introduced Kahhori, a character created specifically for the series, and Marvel has confirmed that Season 3 will debut yet another original character. Matt Chauncey, the head writer for Season 3, has expressed enthusiasm for the mystery character, describing the casting choice as a “dream.” Though the character’s identity remains under wraps, Chauncey promises that this fresh face will add an entirely new dynamic to the series and the Marvel universe. Marvel also revealed that Season 3 will include an episode inspired by 1930s screwball comedies—a unique addition to the show’s usual blend of action and drama.

We caught a few frames of what looks like Ironheart, AKA Riri Williams. Could that be the new character?

X-Men and Other MCU Crossovers

Storm’s debut as the first X-Men character to cross paths with the broader MCU heroes marks a major milestone. Fans have long awaited the integration of X-Men into the MCU, and Season 3 of What If…? offers the perfect opportunity to showcase this beloved character in a new light. Her portrayal as a Mjolnir-wielding Variant aligns with What If…?’s trademark of reimagining iconic heroes in unexpected roles.

This season’s lineup also features other popular Marvel figures like the cosmic judge Arishem and the returning Kahhori. As the multiverse cracks open, fans can look forward to seeing more of their favorite heroes in worlds where the usual rules don’t apply. With White Vision, Agatha Harkness, and a squad of Watchers joining the fray, it’s clear that What If…? will bring together an even larger cast of Marvel icons, Variants, and newcomers.

Fan-Favorite Comic Characters Waiting in the Wings

With Marvel’s expansion into multiverse storytelling, fans have high hopes for characters that haven’t yet made their way into the cinematic universe. Long-requested heroes like Nova, Beta Ray Bill, Silver Surfer, and Venom could finally make their What If…? debut. Although the X-Men may not fully enter the MCU through this season, What If…? gives the perfect outlet to explore multiversal Variants of long-awaited characters.

As What If…? continues to delve into uncharted realities, this season looks to bring fans both nostalgia and surprises. From new heroes to legendary crossovers, What If…? Season 3 is gearing up to deliver even more of the unexpected. Starting December 22, 2025, fans can tune into Disney+ to explore what happens when the Marvel Universe takes an alternate route.