The Russo Brothers launched a mystery campaign for "Avengers: Doomsday", using cryptic clips to hint at major MCU shifts before its December 2026 release.

The Russo Brothers have clarified that the four recent clips released alongside "Avatar: Fire and Ash" are not traditional trailers or teasers for "Avengers: Doomsday", but instead "stories" and "clues" meant to be analyzed. Featuring Steve Rogers, Thor, the X-Men, and Wakanda, each clip presents narrative fragments hinting at character arcs and a looming threat, with recurring themes of endings and preparation. A countdown clock and the phrase "#DoomsdayHasBegun" suggest a larger, interconnected campaign building toward the film’s December 2026 release, though the full purpose remains unclear.