Two convention trailers — Sony’s roughly four-minute "Beyond the Spider-Verse" clip and Marvel’s "Avengers: Doomsday" footage — spread online in unauthorized posts during D23 leak season.
The Spider-Verse material appears to be an unfinished opening sequence: Miles Morales escapes Earth-42 captivity, fights Prowler-Miles and alt-Aaron, and the footage again shows the June 18, 2027 release date.
Christopher Miller said the Spider-Verse leak was "unfinished" and "not fully rendered," while Sony has been issuing copyright takedowns as copies keep resurfacing on X and elsewhere.
The Doomsday trailer centers on Doctor Doom, with the Fantastic Four describing him as a lost former friend before Robert Downey Jr.'s Doom vows to "burn away" stolen lives and is shown overpowering Thor and commanding Sentinels.
Both clips had previously screened only behind closed doors — Spider-Verse at CinemaCon and Doomsday at San Diego Comic-Con — turning fan-only previews into wider spoiler leaks.