Avengers: Doomsday trailer wows CinemaCon crowd – but fans at home can’t watch it yet

Marvel Studios debuted the full-length Avengers: Doomsday trailer exclusively at CinemaCon in Las Vegas on April 16, unveiling Robert Downey Jr. as Doctor Doom — but Disney has yet to release the footage online, leaving millions of fans unable to watch it.

What the CinemaCon trailer revealed

According to The Hollywood Reporter, the trailer opened with Robert Downey Jr. walking on stage at the Colosseum at Caesars Palace before the footage rolled — a theatrical reveal that set the tone for what followed.

Eyewitness accounts describe a sequence in which Chris Evans‘ Steve Rogers catches Thor’s hammer Mjolnir — echoing a moment teased in Avengers: Age of Ultron more than a decade ago. The footage reportedly includes Gambit squaring off against Shang-Chi, Mystique shapeshifting into Yelena Belova, and Patrick Stewart‘s Professor Xavier delivering a multiverse warning.

Downey appeared in full Doctor Doom armour with the mask intact — marking his first proper on-screen look in the role since his shock casting announcement following his Iron Man arc.

Why the trailer still isn’t online

CinemaCon is an industry-only trade event run by the National Association of Theatre Owners each April in Las Vegas. Studios routinely debut exclusive footage there without an immediate public release — the footage is intended first and foremost for exhibitors, the cinema chains who decide how many screens a film receives.

According to Screen Rant, Marvel has followed an unusual staggered rollout for Doomsday‘s marketing, attaching four separate teasers to Avatar: Fire and Ash in cinemas and only releasing each online days after their theatrical window. The same delayed model appears to be in play for the full trailer.

Disney has not announced a date for when the trailer will land on YouTube or other platforms. Industry observers note that a major digital drop could arrive with as little as a few hours’ notice, timed around a social media moment or a high-profile broadcast slot.

Character spotlight: who appeared in the footage

The trailer reportedly assembled one of the largest casts ever seen in an MCU film. Click a character below to learn more about their role in the footage described by eyewitnesses.

Fan reaction and social media fallout

Social media erupted within hours of the CinemaCon screening. Hashtags relating to the film and Doctor Doom were trending across platforms, driven largely by secondhand descriptions from journalists and industry attendees who were present at the screening.

The frustration is compounded by the sheer volume of names attached to the footage. Beyond Evans, Hemsworth, Downey, and Stewart, the trailer reportedly features a roster of mutant and Avenger characters whose casting details have been among the most closely guarded secrets in recent MCU history.

For context on the scale of anticipation, our earlier report on the CinemaCon screening broke down the confirmed scene-by-scene details as reported by those in the room.

Days until Avengers: Doomsday hits cinemas

With no trailer yet available online, the December 18 theatrical release date feels simultaneously far off and closing fast. Here’s how long fans have left to wait.

What to expect next

Marvel’s playbook for major releases typically includes a wider public campaign push in the weeks after a CinemaCon debut. Given the December 18 release date, a full marketing blitz — including multiple public trailers, merchandise reveals, and press junkets — is likely to follow across the coming months.

The studio has also been building toward Doomsday as the centrepiece of Phase Six. The Russo Brothers, who directed Infinity War and Endgame, are once again at the helm — a fact that has only amplified the sense that Marvel is swinging for a genuine event film.

For the latest updates as they break, visit our Film section or check our earlier coverage of the Sony CinemaCon announcements from the same event.

Reported from publicly available interviews and verified press sources. Last reviewed April 18, 2026.