We've already known for some time that Joss Whedon has just as much psychological torment in store for The Avengers as he does physical pain - with many eyes on the character of the Scarlet Witch (Elizabeth Olsen) as the source of that mental anguish. It's been confirmed that The Witch will have psychic abilities in addition to her power over matter, and the Avengers 2 teaser had several moments suggesting that she gets into the heads of several Avengers team members.
Indeed, after watching The Hulk go ballistic on Tony Stark in the Iron Man Hulkbuster armor, it was clear that team relations are not going to hold up under the strain of Ultron - with characters like Hulk possibly being mentally broken beyond repair. In that sense, if Ultron employs a psychic weapon against his superpowered foes, then Thor would be the other team powerhouse who could be mentally manipulated into becoming a serious threat. And Hemsworth's words seem to suggest something like that happening.
The question at hand is: does Thor get turned around into an evil doer (or just a mentally crippled hero?) - or is it something more subtle and insidious than that? Ultron's mission is predicated on the notion that saving the world means eliminating humanity - but Thor is not of humanity, he is something more evolved, as Ultron arguably sees himself. Therefore, maybe the only thing Ultron needs to do is find the right logic to convince Thor that what's best for the universe is humanity's end?
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When you look at it, the Thor vs. Ultron matchup offers opportunity for a lot of rich storytelling. God vs. Technology. Who is the superior evolved being? In the eyes of deities (mythological or technological) is there mercy for humanity? Etc...
One would hope that Age of Ultron gets to delve into some of those questions, but with so many characters and stories to service, we're not holding our breath that it will get as deep as, say, Neil Gaiman's American Gods. Still, we can hope that Thor gets something compelling to do on a character level; because watching Mjolnir smash wave after wave of generic robots would get pretty monotonous.
The Avengers: Age of Ultron will be in theaters on May 1, 2015.
Source: Screen Rant YouTube