A new trailer for Avengers: Doomsday teases the return of Chris Evans as Steve Rogers, framed within the film as a "miracle" arriving to help fight Doctor Doom. However, some fans have seized on visual differences in Evans's appearance to speculate that this version of Rogers may not be the hero audiences know, but an alternate-universe "Hydra Cap" secretly working for Doom, drawing on a well-known Marvel Comics storyline.

The theory stems largely from Rogers's altered look, including a beard and longer hair, compared with an earlier teaser showing him at home with a baby after the events of Endgame. Fans point to the character's ability to wield Mjolnir as supporting evidence, noting that in the comics Hydra Cap also lifted the hammer through deception, and that Doom could plausibly have manipulated the spell protecting it. Whether this twist actually appears in the film remains unconfirmed, with IGN's report describing it as fan speculation rather than confirmed plot detail. Avengers: Doomsday is scheduled for release in cinemas on 18 December 2026.