The Almighty Thor, he used to call himself that before not defeating Thanos. We see him really regretful about it in the tailer, let's remember it:





What will happen to the asgardian in the movie? All this theory is all mine, so everything comes from my point of view... so let's go.

Thor is blaming himself for what happened and nobody can change his mind, but time passes and the Avengers should have found a way to stop Thanos; going back in time. Thor sees the light again and helps his friends.

In my opinion, they'll go to New York's battle at the moment they defeat Loki. Thor will try to talk to his little brother, trying to convince him to help them, but the Loki of that time is still bad (or controlling his mind). The God of Mischief will betray the Avengers, again.





The Avengers will come back to the present and Thor will feel bad again, but he'll remember the vision he had while figthing Ultron: Heimdall tells him the asgardians are in Hell... in Hellheim.







Thor…