Given her three appearances and counting in the Marvel Cinematic Universe (it'll be four with Avengers: Age of Ultron), Scarlett Johansson's Black Widow is one of the key feathers in the Marvel Studios cap. And yet, she still doesn't have a movie of her own.

There's no official movement on a Black Widow film, but perhaps new comments from Game of Thrones veteran Neil Marshall will stir the pot.

Marshall, who directed the battle-heavy "Blackwater" and "The Watchers on the Wall" episodes of the hit HBO fantasy series, recently told Vanity Fair he's interested in directing a female-driven action movie, specifically citing Johansson's Black Widow as a dream subject.

"I would love to do a Black Widow movie. That’s perfect, I would love to do that," said Marshall, who directed the pilot episode of NBC's Constantine. "That character is really interesting, she doesn’t have any superpowers, she just has extraordinary skills, and the world that she comes from, being this ex-K.G.B. assassin, I find that really fascinating, yeah."

Even if it's not Black Widow, Marshall said he's eager to make a big action movie with a female star in the lead role — again, citing Johansson as the perfect example.

"I’m more interested in characters like Scarlett Johansson in Lucy," said the filmmaker, whose credits include Dog Soldiers and Centurion. "I’m less interested in people with superpowers because I can’t identify with them. Very rarely do they get killed off, and when they do get killed off, chances are they’re going to be back … somehow. Yes, I’d love to do a big splashy movie with a great female lead, but it has to be someone I can believe in."

Even if she doesn't get her own movie, Black Widow will return in Age of Ultron on May 1, 2015, and again in Captain America 3 on May 6, 2016.