Thor is imprisoned on the other side of the universe without his mighty hammer and finds himself in a race against time to get back to Asgard to stop Ragnarok—the destruction of his home-world and the end of Asgardian civilization—at the hands of an all-powerful new threat, the ruthless Hela. But first, he must survive a deadly gladiatorial contest that pits him against his former ally and fellow Avenger—the Incredible Hulk!