“Avengers: Endgame” serves as the culmination of the Marvel Cinematic Universe’s “Infinity Saga,” picking up after Thanos’s devastating snap that wiped out half of all life. The remaining Avengers, grappling with loss and despair, embark on a risky “time heist” to collect the Infinity Stones from the past, hoping to reverse Thanos’s actions and restore their fallen comrades. Facing formidable challenges and emotional sacrifices, they confront Thanos in a final, epic battle that determines the fate of the universe.