It’s a beautiful day in New York City and the Avengers have arranged a surprise birthday picnic for Peter Parker in Central Park—but the celebration is violently interrupted when a menacing rainbow suddenly crystalizes in the sky, dumping a shellshocked Thor and Loki into the middle of the party with a loud crash. The Avengers swiftly decamp to Stark Tower, where Doctor Strange freezes time to give the heroes a chance to regroup and formulate a plan. Thor and Loki warn the group that Ragnorok, the end of the world, has come, but before they can take action against it, they must understand how the world began.