Joss Whedon took a break from shooting the highly-anticipated Marvel Phase Two sequel Avengers: Age of Ultron to make an appearance at the London premiere of Guardians of the Galaxy. During an interview with Hey U Guys, the filmmaker revealed that his Marvel Phase Two sequel features four primary female characters.

"There are four prominent female roles in the center of the movie, and, I think, a more balanced presence throughout the movie. The guys are all there. There are more of them too. Hopefully it will satisfy everybody. I'm not trying to fulfill an agenda, but I am interested in men and women. I'm interested in grown-ups who act like children and dress like clowns and punch each other."

We know that Black Widow (Scarlett Johansson) and Maria Hill (Cobie Smulders) are returning for the sequel, along with new cast member Elizabeth Olsen (Scarlet Witch), but who is this mysterious fourth female character? The site asked if Carol Danvers, a.k.a. Captain Marvel will be seen on screen anytime soon, asking the director to make some sort of facial expression that hints at her involvement. After making a ridiculous face for the camera, here's what Joss Whedon had to say.

"I don't have the facial reaction you're looking for. I like her too. That's all I can say."

Producer Kevin Feige revealed back in March that Captain Marvel was being discussed internally as getting her own stand alone movie, possibly before Scarlett Johansson's Black Widow. Do you think Captain Marvel may show up in Avengers: Age of Ultron before this potential stand alone movie? Who do you think this mysterious fourth female character may be in Avengers: Age of Ultron? Chime in with your thoughts below.