“The door has to be open. We just want inclusion,” says Meryl Streep in a new trailer for “This Changes Everything.” The documentary explores gender inequality in Hollywood, both in front of the camera and behind it.

“Media has the power to educate [and] to shape people’s thoughts,” “Grey’s Anatomy” creator Shonda Rhimes emphasizes in the spot. “It also has an incredible power when you get to see someone who’s like you on-screen.” Unfortunately, not everyone gets to have that empowering experience. As “Transparent” creator Jill Soloway explains, most of film and TV is “men making stuff for other men.”

The trailer sees Oscar-winning actress and longtime activist Geena Davis, who is among the project’s exec producers, speaking out about how there are “so few opportunities to feel inspired by … female characters” — because their numbers are lacking on-screen.

“This Changes Everything” premiered at the 2018 Toronto International Film Festival. The doc is screening at theaters across the U.S. for one night only on July 22 via Fathom Events.