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Downey Jr. and Chalamet Champion ‘Dunesday’ for Dec. 18, 2026 Clash of Avengers: Doomsday and Dune: Part Three

The nickname surfaced at a Los Angeles Q&A, signaling Marvel’s theater‑only teaser rollout as Dune positions for IMAX.

Overview

  • Both films remain slated for December 18, 2026, with reporting indicating neither studio has shown plans to shift the date.
  • Robert Downey Jr. told the LA audience, “We both have films opening on December 18… We’re thinking ‘Dunesday,’” joking they’ll see if they’re still friends by then.
  • Coverage draws parallels to 2023’s ‘Barbenheimer,’ noting that simultaneous releases can spur double features and that Barbie and Oppenheimer combined for about $2.5 billion.
  • Marvel’s campaign for Avengers: Doomsday includes four teasers playing only in theaters alongside Avatar: Fire and Ash screenings.
  • Dune: Part Three advances as the concluding chapter of Denis Villeneuve’s trilogy, with reporting highlighting its IMAX emphasis and ongoing post-production.