The first teaser for director Zal Batmanglij’s new film The East, which debuted yesterday at the Sundance Film Festival, isn’t so much a trailer as it is the kind of warning video you’d expect from the hacktivist collective Anonymous — if Anonymous took up eco-activism and decided to aim their crosshairs at corporations destroying the environment.

In the video, a group of environmental activists who call themselves “The East” promise to “counterattack three corporations in the next six months for their worldwide terrorism.” The fast-cut teaser is narrated by star Ellen Page (Juno) who plays one of The East’s most devoted members.

The teaser also offers glimpses of True Blood’s Alexander Skarsgård as an East-er named Benji, and the film’s star (and co-writer) Brit Marling, who plays a woman named Sarah hired by big corporations to infiltrate the group. The video also represents the sort of media that Batmanglij believes more activists will use to get their message across in the 21st century.

“When the Pentagon papers came to light, it took The New York Times months to release them,” said the director in the film’s production notes. “All WikiLeaks has to do is put a video on YouTube and it goes viral, reaching millions. The modern whistle blower just videotapes something and puts it online.”

And this is coming from someone who did his homework. Batmanglij and Marling, who previously collaborated on the smart cult flick Sound of My Voice, actually spent a summer stowing away on trains and living off the grid in tent cities and abandoned dwellings.

“We discovered anarchist and freegan collectives all over the country and lived with some of them for a while,” Marling said in the notes. “We weren’t thinking at the time that a movie would come out of the experience. We were just living our lives and the story gradually began to take shape.”

Check out the first teaser trailer for The East above.