The Mighty Thor is imprisoned on the other side of the universe...without his mighty hammer. He's in a race against time to get back to Asgard to stop Ragnarok, the cataclysmic 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.