Things got interesting with the upcoming 'Suicide Squad' movie when it was revealed that Jesse Eisenberg would be returning after 'Batman vs. Superman' to star as Lex Luthor. Then, things got really interesting when it was revealed that Jared Leto was in talks to star as The Joker, introducing Batman's greatest nemesis in the new era of 'Justice League' films. What was once thought to be a ragtag group of B-side villains is now shaping up to be a roster full of DC's evil A-list villains. And, now you can even more iconic villain to the lineup. What would any Joker appearance in 'Suicide Squad' be without Harley Quinn, who will be played by 'Wolf of Wall Street' star Margot Robbie.