Returning to Asgard in search of a mysterious enemy hunting the Infinity Stones, Thor discovers that the actions of his brother Loki, who has seized the throne of Asgard, have led to the approach of the most terrible event of all - Ragnarok. According to legend, this will mark the final battle of Asgard, the consequence of which will be its complete destruction. In an attempt to prevent this event, Thor must enlist the help of his fellow Avengers, the Hulk. Together they will face the worst enemy of all nine worlds - the fire demon Surtur, whose goal is to fulfill the prophecy of Ragnarok and destroy the nine worlds.