Following the first teaser in April, Lucasfilm offers up the first official trailer for the Star Wars spinoff, Rogue One: A Star Wars Story.

The film is set before the events of Star Wars: A New Hope, telling the story of unlikely heroes who have united to steal plans to the dreaded Death Star. We also get a first glimpse at Darth Vader.

The cast includes Felicity Jones, Diego Luna, Ben Mendelsohn, Donnie Yen, Jiang Wen, Mads Mikkelsen, Alan Tudyk, Riz Ahmed, and Forest Whitaker.

Rogue One: A Star Wars Story opens Dec. 16.