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New ‘Doomsday’ Teasers Set Darker Tone for Thor as X-Men Vignette Leaks and Young Avengers Buzz Grows

A theater-first rollout with tight secrecy is driving interest ahead of the December 18, 2026 opening.

Overview

  • The Russo brothers released a Thor-focused teaser featuring a solemn prayer and the #FearDoom tagline, signaling a move away from the character’s recent comedic tone.
  • Teasers are playing in theaters, with an X-Men–centered vignette leaking online as fans applaud Cyclops’ spotlight and legacy Fox actors previously confirmed in Marvel’s cast reveal.
  • Kathryn Newton was seen wearing an Avengers: Doomsday crew hat, prompting speculation that Cassie Lang could appear, though Marvel has not confirmed her involvement.
  • A fresh batch of unverified reports mentions a Tobey MaguireHugh Jackman clash, a masked female ally for Doctor Doom, and possible Ms. Marvel appearances.
  • Industry chatter says trailers may include digital removals or deliberate misdirects, while fans dissect fleeting number frames some believe reference Endgame scenes, with no official validation.