Thor's world is about to explode in Marvel's Thor: Ragnarok. His devious brother, Loki, has taken over Asgard, the powerful Hela has emerged to steal the throne for herself and Thor is imprisoned on the other side of the universe. To escape captivity and save his home from imminent destruction, Thor must first win a deadly alien contest by defeating his former ally and fellow Avengers... The Incredible Hulk!

http://comicbook.com/marvel/2017/05/19/thor-3-synopsis-ragnarok/

interesting part about Hela though if we go by the teaser then it doesn't make sense.

MEH

hmmmm

I think it's safe to say he won't 'defeat' Hulk

I also think they're trying not to reveal much that's why the plot is so vague

This is making me even more excited for the movie!

I mean, Hela wants the throne but she slaughters everyone :)

Pretty basic description.