When Wentworth Miller made his debut as Leonard Snart on The Flash in 2014, he had no idea that he one day would be starring as a lead in his own DC universe series on The CW.

Wentworth Miller in DC's Legends of Tomorrow

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He came on for one guest spot to play a villain dubbed Captain Cold, and then that appearance turned into more. Before he knew it, executive producers Greg Berlanti, Marc Guggenheim, Andrew Kreisberg and Phil Klemmer were offering him a role in DC's Legends of Tomorrow , which premieres on January 21st."There was no script, but I said, 'I'm in, regardless' and was committed to Legends before I saw a single page," Miller admitted to IGN. "It was a lovely surprise to find so much meat on the bone."Instead of playing a villain like he has on The Flash (though he was called out for doing a pretty shoddy job of being an antagonist in that series' midseason finale ), Miller is turning Snart into something of a hero on Legends of Tomorrow. Captain Cold joins fellow Arrow/The Flash alums Heat Wave (Dominic Purcell), Martin Stein (Victor Garber), Sara Lance (Caity Lotz), Ray Palmer (Brandon Routh), Hawkgirl (Ciara Renee), Jax Jackson (Franz Drameh) and Hawkman (Falk Hentschel) who are brought together as a team by time traveler Rip Hunter (Arthur Darvill) to stop the villainous Vandal Savage (Casper Crump) from destroying the world.Miller would argue Snart isn't out to be a hero, but that doesn't stop the character from evolving as early as in the series' two-hour premiere. Continue reading for IGN's full interview with Miller as he discusses bringing more levity to Captain Cold, what it will take for Snart to step up and why he has a chip on his shoulder about Rip Hunter -- plus, what he hopes will come of an eventual return to The Flash.

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I'm not sure at the outset Snart has latched onto the promise of "hero." I think he's intrigued by the idea of "legend." [Laughs] It probably seems more available to him. I think he may judge himself as a man with a certain kind of past, a certain record, and maybe hero status is not for him. Maybe he's not worthy. However, through the course of his experience time traveling and working with Rip and the others, he starts to connect, build relationships, bond unexpectedly, and grows and changes as a result. I hope he always holds onto his edge, his darkness and his humor, but we do start to see him sit more squarely in his shades of gray.I think it's necessary when you're dealing with a dark show that has explosion and violence to have defined moments of lightness and humor, even romance. It's important, and it deepens the character, of course. I think ultimately that's why the audience will tune in longterm, for the characters and the relationships.No. I had my one guest star on The Flash, and that became several guest stars, and then they mentioned this new show. There was no script, but I said, "I'm in, regardless" and was committed to Legends before I saw a single page. It was a lovely surprise to find so much meat on the bone.I don't think you need to watch Arrow and Flash to appreciate what it is Legends has to offer. The beauty of this show -- and they do this on Flash, and they did this on Arrow -- is that we do spend time on character. We do spend time on backstory. We do take a moment in between the sci-fi special effects to tell you who these people are, so that when something happens to them, you actually care.Nothing I can spoil for you, probably, but I have my own personal wish list -- which is different from Snart's wish list. I think Snart has a shopping list. [Laughs] Certain items throughout history that he wouldn't mind possessing, and that's one of the cool things about his journey, is that he goes into it for completely selfish reasons. He doesn't particularly care about Savage. He doesn't particularly care about saving humanity. He's in it to steal stuff. But then he is surprised by this personal relationship that develops between himself and Savage. Because Snart is a team player in that he's protective of his team. So when Savage starts going after us and wounding us and kicking ass, then Snart has to step up and address this adversary in a much more serious fashion.I thought of Snart as the guy calling the shots and he's a team player in that he has a team and everyone has to do what he says. I did not take it as far as, "If you come for someone on my team, I will in turn come for you." But that is the dynamic, and that's been a lot of fun to explore.

Continue on to Page 2 for more on how Snart's sister Lisa feels about being left out of Legends of Tomorrow, what he'd like to do if he returned to The Flash and the twist Miller would like to see with Legends' villain in future seasons.