Harley Quinn has become something of a throughline for DC movies, if such a thing exists. Margot Robbie's iconic version of the character has appeared in disparate movies including David Ayer's Suicide Squad, Cathy Yan's Birds of Prey, and now James Gunn's The Suicide Squad. In all these ensembles, she's stolen the show. And in a recent Q&A following a screening of The Suicide Squad, Gunn said that Robbie is "the greatest actor [he's] ever worked with."

"I came to Margot, and we talked about the script after she read it," Gunn said. "And when we said something about Harley, she would always be like, 'Yeah, but you know more about her than I do.' Because I've read every single comic book Harley Quinn has ever been in. I've watched every animated movie she's ever been in. So she has no ego, is one of the reasons why she's probably the greatest actor I've ever worked with--not because she says I know more than she does, but because she just comes into it in such a way that she's willing to go as far as she possibly can with the character.

"And she's incredibly prepared, incredibly disciplined, able to do the action stuff, able to do the comedy, able to do the drama, and she's an incredibly well rounded actor."