While it may have become just the fourth movie in history to earn $2 billion at the box office and stunned Marvel Cinematic Universe fans around the world with a gut-punch of an ending, it felt like Avengers: Infinity War was largely forgotten by the time Endgame rolled around twelve months later to snatch Avatar's crown as cinema's biggest-ever hit, undo many of the story's major events and draw the decade-long Infinity Saga to an epic conclusion.