"Hello, Earth! We have a terrible decision to make: An innocent life versus the future of all mankind..." Clara and the Time Lord head to the moon in a new trailer for next week's episode of Doctor Who, "Kill the Moon", airing Saturday, October 4 at 9 PM ET on BBC America.

In the near future, the Doctor (Peter Capaldi) and Clara (Jenna Coleman) find themselves on a space shuttle making a suicide mission to the moon. Crash-landing on the lunar surface, they find a mining base full of corpses, vicious spider-like creatures poised to attack, and a terrible dilemma. But when Clara turns to the Doctor for help, she gets the shock of her life. With special guest star Hermione Norris (MI-5, Wire in the Blood).

Will the life of one innocent person be spared to ensure the future of all humanity? Will the Time Lord and Clara actually "kill the moon" as referenced in the title? Take a look at the first footage from this upcoming episode, which was written by Peter Harness and directed by Paul Wilmshurst.