In Avengers: Doomsday, the Avengers face their greatest challenge yet as Kang the Conqueror unleashes a multiversal war, threatening to collapse all timelines into chaos. The story begins with the Avengers scattered and struggling to recover from the fallout of Kang’s previous attacks.

Doctor Strange discovers that Kang has created a “Doomsday Engine,” a device capable of erasing entire universes to consolidate his power. The team, led by Captain Marvel, Thor, and Sam Wilson’s Captain America, must reunite and recruit new heroes, including the Young Avengers, to stop Kang.

The climax takes place in a shattered multiverse, where the Avengers face multiple versions of Kang in an epic battle. In a shocking twist, Iron Man (a variant from another timeline) sacrifices himself to destroy the Doomsday Engine, mirroring Tony Stark’s sacrifice in Endgame. The film ends on a bittersweet note, with the multiverse saved but at a great cost, setting up future MCU storylines.