#3 Deprived of his mighty hammer Mjolnir, Thor must escape the other side of the universe to save his home, Asgard, from Hela, the goddess of death.
Two years after the events in Sokovia, Thor is imprisoned by the fire demon Surtur, who reveals Odin is not on Asgard anymore, claiming soon, Asgard will be destroyed by the prophesied Ragnarök. Thor defeats Surtur thinking that that would prevent Ragnarök from happening. It doesn't.