Alex Zalben/MTV News

With reporting by Josh Horowitz

The whole prospect of DC and Warner Bros. bringing their ambitious villain team-up movie "Suicide Squad" to the screen is exciting, including the stellar cast that includes Will Smith, Jared Leto, Cara Delevingne and more. But possibly no aspect is as intriguing to comic book fans as Margot Robbie's role as Harley Quinn.

The insanely popular Batman baddie has been portrayed numerous times in cartoons and video games, but never live-action. So when we caught up with Robbie at the Sundance Film Festival while she was promoting her movie "Z for Zachariah," we had to ask about whether she was nervous inhabiting the Joker's sometime girlfriend.

"Yeah, I guess it's intimidating because there's obviously a lot of people I want to please, and a character I have to do justice," Robbie said. "But it's a challenge, I'm definitely up for it, and hopefully I don't disappoint."

Quinn has gone through a number of different iterations and variations on her look and voice -- from the original harlequin costume, to her more recent Juggalette inspired look from the "Arkham Asylum" video games, and currently in DC's comic books. So which of these looks -- or a new one -- will Robbie portray in 2016?

"We haven't gotten too far into it, we're still pretty far off..." Robbie continued. "I'm actually shooting a movie before that, so my focus is kind of on that at the moment, we haven't really gotten into the logistics of everything yet."

It wasn't a huge surprise that Harley would appear in the David Ayer directed movie: she's a current member of the Suicide Squad in the comics, and made a brief cameo appearance (or at least a vocal cameo) on The CW's "Arrow," also as a possible member of the Squad. But actually surprising? It's that Robbie wouldn't just bring Harley to life, she'd be paired with her four-color beau The Joker, as played by Jared Leto.

Acting opposite Leto is a daunting prospect in any movie, let alone when he's taking on one of the most iconic villains of all time. So how does Robbie feel about that, huh?

"Great, great co-star," Robbie said, before remembering her "Z for Zachariah" co-stars Chris Pine and Chiwetel Ejiofor were flanking her. "Big shoes to fill, but--"

At which Pine and Ejiofor broke out hysterically laughing, with Pine quipping, "Not as cool, but..."

Hey, we think Captain Kirk could take The Joker in a fight any day.

"Z for Zachariah" is currently playing at the Sundance Film Festival.