Which character has had the biggest physical transformation over the course of the Marvel Cinematic Universe to date?

Steve Rogers/Captain America is certainly an option. Groot is another. What about Thor?

Going into "Avengers: Infinity War" -- which opens this week -- Chris Hemsworth's character has short hair, one eye, and he's dirty as hell. He's still "a handsome, muscular man," but also "hideous."

That's a far cry from the golden god of the first "Thor" movie, which came out in 2011.

Marvel Studios boss Kevin Feige tends to make good decisions -- box office receipts don't lie -- but he told Uproxx he does regret going a little too far with his blond ambitions for Thor:

"Definitely, the one thing I would definitely do differently if I had to do it over again, is we would not have dyed Chris Hemsworth's eyebrows blonde in the first 'Thor.' Because we were like, Thor is blonde! He has to be blond! And Hemsworth was great and awesome and pulled it off, but there are a couple of shots I watch and I'm like, 'Oh my God, that poor guy, we made him freaking dye his eyebrows! That's ridiculous!' And I can laugh about it now because Hemsworth IS Thor and he doesn't need long hair, or a cape, or a hammer, or two eyeballs to be Thor."

It's never a bad idea to err on the side of being faithful to the comic book. That's usually the first knee-jerk complaint from fans -- that such-and-such doesn't look right. But, as we learn over time, it's the least important detail in the long run.

Here's how Chris Hemsworth's eyebrows look when you let them just be themselves:

TOPSHOT-US-ENTERTAINMENT-FILM-PREMIERE-AVENGERSHonestly, Thor's facial hair could've ended up a lot worse. "Thor" was directed by Kenneth Branagh -- and you saw what he did with Hercule Poirot's mustache, right? There but for the grace of Odin...

Thor meets the Guardians of the Galaxy in "Avengers: Infinity War," and we know he'll be featured in "Avengers 4" next year. And then ... that might be it, since Hemsworth's contract has ended.

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