A new trailer for Rogue One: A Star Wars Story aired during Olympics coverage recently and it gave us much more information on the plot of this new film than we’ve heard before.

Rogue One takes place before the events of Star Wars: A New Hope, tells the story of unlikely heroes who have united to steal plans to the dreaded Death Star. If you’re having trouble fitting this new movie into the timeline, think of it as in-between Episode III: Revenge of the Sith and Episode IV: A New Hope (the original Star Wars movie); in other words, after Anakin Skywalker becomes Darth Vader but before Luke and Leia grow up and join the rebellion.

I’m really excited about this new movie. There’s such a rich universe in the Star Wars movies, there must be plenty of stories other than those focusing on the Skywalker family to be told. ┬áIt’s a familiar setting and a familiar world, but with new characters to meet and know.

The cast includes Felicity Jones, Diego Luna, Ben Mendelsohn, Donnie Yen, Jiang Wen, Mads Mikkelsen, Alan Tudyk, Riz Ahmed, and Forest Whitaker. “Rogue One” is directed by Gareth Edwards, produced by Kathleen Kennedy, Allison Shearmur, and Simon Emanuel, executive produced by John Knoll and Jason McGatlin, and co-produced by John Swartz and Kiri Hart.

Rogue One: A Star Wars Story opens in theaters December 16, 2016.