Imprisoned on the planet Sakaar, Thor must race against time to return to Asgard and stop Ragnarök, the destruction of his world, at the hands of the powerful and ruthless villain Hela.
The Guardians struggle to keep together as a team while dealing with their personal family issues, notably Star-Lord's encounter with his father, the ambitious celestial being Ego.
With the world now aware of his identity as Iron Man, Tony Stark must contend with both his declining health and a vengeful mad man with ties to his father's legacy.