Disney and Lucasfilm have unleashed the first full trailer for the upcoming "Star Wars" spin-off film "Rogue One," revealing a highly-anticipated glimpse at the franchise's ultimate villain, Darth Vader.

The two-minute, 15-second clip sets the scene for the "Star Wars" story which takes place just before 1977's "A New Hope", with the Death Star still in construction and Vader in his prime as the Emperor's galactic enforcer.

Mercenary rebel Jyn Erso (played by Felicity Jones) and her resistance fighter sidekick Captain Cassian Andor (Diego Luna) take the limelight in this first full teaser, but fans also get a closer look at other characters which make up the rag-tag rebel team, including Forest Whitaker playing Saw Gerrera, a new droid character, and familiar AT-ATs -- as well as a brief glance at Darth Vader.

"Rogue One: A Star Wars Story" -- the first in Disney's "Anthology Series" of spin-off films that will also include the currently untitled Han Solo prequel movie due in 2018 -- is due out in theatres on Dec. 16.