"Rebellions are built on hope," declares Felicity Jones' Jyn Erso in the latest TV promo for Rogue One: A Star Wars Story. "This is your chance to make a real difference."

In a new trailer for the upcoming Star Wars spinoff, Jones' heroine Jyn Erso rallies the Rebel Alliance troops for an epic battle against the Galactic Empire, who is building a weapon of cosmic mass destruction. (That would be the Death Star, obviously.)

While Disney was reportedly unsatisfied with the early tone of the film, subsequently ordering a number of summer re-shoots, the latest trailer retains its somewhat darker, serious atmosphere (after all, this is technically a war movie) while Jones' character breathes a new sense of hope, cooperation and triumph into the film. Watch above.

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

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