A new trailer for "Rogue One: A Star Wars Story" was revealed during last night's Olympics coverage.

George Lucas' upcoming film takes place before the events of "Star Wars." It tells the story of "unlikely heroes who have united to steal plans to the dreaded Death Star," according to a press release.

The film, which opens in theaters December 16, stars Felicity Jones, Diego Luna, Ben Mendelsohn and more.

Watch the trailer above.