Thor learns from Surtur that Odin ( Anthony Hopkins) is not on Asgard, so uses Mjolnir (his hammer) to escape and destroy Surtur, keeping his crown/skull, the demon's power source. Surtur believes his destiny is to bring about Ragnarok, the complete destruction of Asgard. Thor ( Chris Hemsworth), having failed in his quest to locate the Infinity Stones and having also been dumped by Jane (although he insists it was a 'mutual dumping') is hanging in chains above a fire pit before being brought before the monstrous fire demon Surtur. The story opens about two years after the events in Avengers: Age of Ultron (2015)'.