LONDON - The term “star-making” is overused in film journalism, but it could hardly be more appropriately applied than to the role of Loki – the suavely devious Marvel villain who made classically-trained British theater actor Tom Hiddleston a globally recognized face.

Now 32 years old, Hiddleston had made only two films (both little-seen UK indies with his ongoing collaborator Joanna Hogg) when “Thor” director Kenneth Branagh invited him to audition for the 2011 superhero blockbuster – first for the role of Thor himself, before his refined demeanor and delivery were deemed more suitable for Loki's high-class villainy. Branagh was an early believer in Hiddleston's star quality, having previous worked with him on stage and television; his instincts were proved correct when Hiddleston not only aced “Thor,” but won an even wider audience when Loki's evildoing was placed front and center last year in Joss Whedon's super-sized Marvel mashup “The Avengers.”

Now back to play Loki a third time in “Thor: The Dark World,” the bright-eyed Englishman still shows no signs of jadedness – even if, joining us for a chat deep into a damp, muddy day's filming at London's Shepperton Studios last fall, he could be forgiven for feeling a little weary of the character that changed his career.

Instead, “excited” is the word that crops up most frequently in our interview, as he enthuses about finding new layers in the character in what he describes – and the title suggests – is a darker take on Asgard than Branagh's franchise-starter, with Emmy-winning director Alan Taylor (best known for his work on such TV dramas as “Mad Men” and “Game of Thrones”) now at the helm.

“I remember talking about the story for this film with the producers while we were running around doing press for 'The Avengers,' and wondering where we'd go next,” he says. The actor had numerous ideas of his own – “some terrible, some good,” he laughs – a number of which were incorporated into the new film. He regards himself as fortunate to have seen the character through to this point.

“Other people can have their opinion objectively about where Loki should go, but I’ve lived through every moment. And sometimes, you know, I’m the only person who knows how it feels. It's really exciting to feel I know every inch of Loki, to have had some input into him. I'm the only person who’s played him. Other people have written him, other people have shot him, other people have framed him. But I know him inside.”

He's obviously cagey about revealing too much of the film on a narrative level, though he tells us the film picks up where “The Avengers” left off, with Loki back in Asgard, and facing the aftermath of the havoc he wreaked on Earth. “You get to see every character’s perspective on what Loki did,” Hiddleston says, “and they tend to be different and desperate and varying in tone. There's empathy, certainly. It’s a springboard into a new chapter. It means that, as an actor, I'm not repeating myself in any way.”

That goes, he says, not just for Loki, but for everything and everyone in the film. “We’ve established the characters across two films, which means we can color in more shades. Thor can get darker as a character, and more complicated. It means that Loki can get even more complexity and dimension. What really is the most interesting thing about being alive is that there is no black and white. There are many shades of gray.”

The title “The Dark World” is a direct reference to the film's introduction of Marvel supervillain Malekith, ruler of the Dark Elves, to proceedings; played by Christopher Eccleston, he's a character with whom Loki enjoys “a degree of mutual recognition.” But the “dark world” portrayed in the film, according to Hiddleston, isn't entirely that literal.

“It’s not just about the mythological and physical battle between dark and light,” he says. “There’s something there about growing up, accepting responsibility no matter who you are – whether you are a crowned king, a king in waiting or a shamed prisoner. Accepting responsibility and growing up is a dark experience. It’s not easy. What’s exciting about this material is that, emotionally and psychologically and spiritually, we sit in the middle of it.”

Though he won't be drawn into much detail on how Loki's character has evolved in the new film, he will say that his relationship with “Thor” – played once more by Chris Hemsworth – remains “consistently ambivalent in a way that's true to the comics.”

Guy Lodge is a South African-born critic and sometime screenwriter. In addition to his work at In Contention, he is a freelance contributor to Variety, Time Out, Empire and The Guardian. He lives well beyond his means in London.