Dylan O'Brien, back in action: Actor talks about his return after on-set accident

For the past year, Dylan O'Brien has been in hiding. He spent most of his time inside his home in Sherman Oaks, wondering whether he'd ever be the same person he was before the accident. Not just emotionally, but physically too: After major reconstructive surgery that left him with four metal plates holding one side of his face together, he feared he'd never look the same again.

"It's a miracle, what they've done," O'Brien says, placing his hand on his cheek. Indeed, the actor's team of doctors must have done incredible work, given the fact that he looks almost exactly as he always has - the boyish teen heartthrob who has amassed an army of young female fans since he began working on MTV's "Teen Wolf" at 18.

Of course, he's 26 now, so he's filled out a bit, and there's also a hint of patchy scruff on his face. He had enough gravitas that the producers of "American Assassin," which opened nationwide Friday, felt confident casting him as the grizzled action-hero Mitch Rapp - even though the character in Vince Flynn's bestselling books