Avengers: Infinity War was such a vast film, both in scale and in the cast, that it’s difficult to point to one central place as the location or one character as the film’s center, but if you had to, it would have to be Thanos. The Russo Brothers have said as much, as well. During the promotion for the film, they sat down with The Telegraph India and talked about their approach:
“We thought it was fascinating to tell a story from the point of view of a villain. So when you watch the film, you’ll see that the film is told from Thanos’ perspective. That offers a unique insight into our heroes, but it also offers a unique insight into villains and how they think.”
If Thanos is at the center, it would be hard not to put Thor directly next to him. Although Tony Stark and Doctor Strange are also focal characters, Thor has his own storyline, basically. We’re just coming off of the heels of Thor: Ragnarok where he’s lost his father and had to destroy his home in order to defeat his evil sister. Now, he’s witnessed his brother bite the bullet once again. Only this time, there’s unlikely to be any resurrections or trickery.
After being rescued by the Guardians of the Galaxy, Thor is accompanied by Rocket and Groot on his own mission to Nivadellir to acquire a “Thanos-killing weapon,” which just so happens to be Stormbreaker. The trip would be separate from the rest, who were all teaming up to stop Thanos from getting his hands on the Infinity Stones. Per CinemaBlend, Joe Russo explains that Thor’s journey wasn’t always heading to Nivadellir to have Eitri forge the weapon:
“We explored a lot of different ideas of where Thor could go for that weapon. We even had versions of the story at one time where he was going to visit this sort of ghost of his dead grandfather – which was one version we were playing with that we didn’t end up using. I am happy where we had settled.”