Watch the new "Star Trek Into Darkness" trailer here

A third trailer for the upcoming "Star Trek Into Darkness" has just been released and it's the longest (2:18), most action-packed, and most revealing of the bunch, as we finally get a sense of who Benedict Cumberbatch's evil John Harrison character really is.

Cumberbatch (best known as Sherlock Holmes) was first rumored to be playing classic "Trek" bad guy Khan (it's even still on the movie's IMDB page), but in December, a caption for an official still from the film revealed the character to be an unknown John Harrison. This trailer, however, helps to fill in the blanks. Harrison is apparently a former top agent for Starfleet that has gone rogue, and wants total destruction.

And Cumberbatch proves to be the ultimate evil genius. He spews lines like, "You think your world is safe. It is an illusion. Enjoy these final moments of peace," with the ease and wickedness reminiscent of some of cinema's most memorable villains (Hannibal Lecter comes to my mind for some reason).

It quickly becomes apparent that Harrison is going to cause lots of problems for Kirk, Spock and the rest of the crew, especially when he calmly and matter-of-factly states: "I am better," he tells Kirk, who asks, "At what?" "Everything," he replies. And I believe him.

The movie, directed by J.J. Abrams, hits theaters on May 17.

Tell us: What do you think about this twist on Cumberbatch's character? Did you see it coming?