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About
Dunesday refers to the scheduled release date of two blockbusters, Avengers: Doomsday and Dune: Part Three. Both set to open December 18th, 2026, the event is similar in nature to Barbenheimer.
News of the shared release date sparked conversation on various social media platforms, such as Reddit, X / Twitter and TikTok, as well as the creation of fan material, photoshopped movie posters and memes.
Origin
News of the joint release date surfaced online sometime in late 2025. On December 29th, 2025, TikTok user @jesus_delacruzz posted a video expressing excitement for the double-feature. The video received about 442,200 views and 95,200 likes in less than three months.
@jesus_delacruzz 24hrs at the movies challenge #avengers #dune #movie #dunesday #marvel ♬ War – Hypnotic Brass EnsembleOn January 15th, 2026, various news and entertainment publications reported on a Q&A with Timothee Chalamet, moderated by Marvel actor Robert Downey Jr. During the event, Downey remarked that the two had competing movies opening on December 18th, stating: "I’m officially kicking off my Avengers campaign… I just want to let it be known that we’re… We decided because…we both have films opening on December 18th, and we decided to coin it… We’re thinking ‘Dunesday.'"
The same day, the official Fandango TikTok account posted footage from the event, which received about 386,000 views and 36,400 likes in less than three months.
@fandango At a #MartySupreme Q&A last night, Robert Downey Jr. and Timothée Chalamet officially coined December 18th to be "Dunesday." Currently, both #AvengersDoomsday and #DunePart3 are scheduled to release on the same day. #movietok #filmtok ♬ original sound – FandangoSpread
The next day, fans of both franchises began posting about their excitement for Dunesday. On January 16th, 2026, TikTok user @valyrethh posted a fancam edit using footage from the event, which received about 579,000 views and 72,800 likes in under three months.
@valyrethh " It's Dunesday Baby " 🥳✌🏻 – Avengers: Doomsday x Dune – EDIT | FUNK CRIMINAL (SLOWED) | #robertdowneyjr #drdoom #avengersdoomsday #rdj #dune ♬ original sound – ValyrethNews of the shared box office date quickly spread online, with many social media users expressing excitement for what could be the next Barbenheimer, while others felt that the ordeal was being forced.
On March 17th, 2026, X user @therealsupes posted an image with both movie posters and the caption: "December 18th will be the greatest movie event of all-time." The post received over 4.7 million views and 11,000 likes in less than one week.
On March 17th, 2026, X user @MCUFilmNews posted a Dunesday video edit, which received 121,600 views and 3,800 likes in less than one week.
Who's Ready! 👀 pic.twitter.com/loTYi0LCRV
— MCU Film News (@MCUFilmNews) March 17, 2026The same day, X user @indiehamlet quoted the post, captioning it: "the mcu pages being the only ones trying to force this dunesday bs lowkey frying me lamsjsh." The post received 63,700 views and 3,300 likes in less than one week.
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