Kathryn Hahn’s Agatha Harkness Is Rumored for ‘Avengers: Secret Wars,’ But Even She’s Not Sure

Kathryn Hahn’s Agatha Harkness has become one of the Marvel Cinematic Universe’s most beloved supporting characters, first stealing scenes in ‘WandaVision’ before earning her own spin-off series, ‘Agatha All Along.’ That series ended with a genuinely dramatic sacrifice, with Agatha giving herself over to Death, played by Aubrey Plaza, to save Billy Maximoff.

That death didn’t stick in the way fans might have expected. Agatha returned in ghost form by the finale’s end, becoming a spirit guide to Billy as the two set off together to track down his missing twin brother, Tommy. That lingering, unresolved thread has kept speculation alive about exactly where her story goes next within the larger MCU.

The latest chapter of that speculation centers on ‘Avengers: Secret Wars,’ with new rumors suggesting Agatha could return as a companion character within the film. According to the reports, her involvement would likely tie directly into Billy Maximoff’s own presence in the massive multiversal crossover, continuing the mentor dynamic the finale of ‘Agatha All Along’ established between them.

Kathryn Hahn is rumored to be returning as Agatha Harkness in ‘AVENGERS: SECRET WARS’

She will be a companion.

(via https://t.co/vUCyuY1M7I) pic.twitter.com/e3K4yiLSGF

— Cosmic Marvel (@cosmic_marvel) September 17, 2026

The theory makes a certain amount of sense given how the series left things. Since Agatha’s ghost is now bound to Billy as his guide, her appearance in ‘Secret Wars’ would likely hinge entirely on whether Billy himself factors into the film’s ensemble, a genuine possibility given his standing as a member of the Young Avengers within the comics. If Billy shows up, the thinking goes, Agatha could easily follow.

Marvel Studios has not officially confirmed any of this casting speculation, and reports have varied on just how solid the rumor actually is. Some outlets have framed it as coming from unverified scoopers online, while others have noted it fits neatly into the franchise’s broader plans to potentially unify multiple corners of its recent Disney+ output within the crossover event.

Hahn’s own comments on the matter have been notably uncertain rather than confirming anything concrete. When asked directly about a potential appearance in ‘Avengers: Doomsday’ or ‘Avengers: Secret Wars’ during an interview, she offered a blunt response. “I don’t think so,” Hahn said. “I think I would know by now,” in comments reported by Collider citing her original interview with The Hollywood Reporter.

That statement doesn’t necessarily rule out a future appearance entirely, given how notoriously secretive Marvel tends to be with plot details even from its own stars. Still, it’s worth tempering expectations given that Hahn herself sounded genuinely unaware of any concrete plans at the time she made those comments.

Regardless of the uncertainty, there’s no denying the appetite among fans for more Agatha content. Marvel executive Brad Winderbaum has previously confirmed the studio wants to continue her story in some form, provided they land on the right idea and timing to do so. Hahn herself has expressed enthusiasm about returning to the role in the past, describing her collaboration with ‘Agatha All Along’ creator Jac Schaeffer as one of the most rewarding creative chapters of her career.

That enthusiasm extends to the character’s broader trajectory within the franchise. With Wiccan increasingly positioned as a key figure heading into the MCU’s next multiversal event, Agatha’s established bond with him gives Marvel a fairly natural narrative bridge to bring her back, whether that happens in ‘Secret Wars’ itself or in another project down the line.

The Russo brothers are directing both ‘Avengers: Doomsday,’ arriving December 18, and ‘Avengers: Secret Wars,’ currently set for release on December 17, 2027. Given the massive scale of both films and Marvel’s tendency to keep major cameos under wraps until the last possible moment, fans likely won’t get definitive confirmation on Agatha’s involvement until much closer to release.

For now, all signs point to this remaining speculation rather than confirmed fact, though the character’s popularity alone makes it easy to understand why fans keep hoping.

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