Saturday, 4th October 2014 8:30PM BBC One (45 mins)
In the near future, the Doctor and Clara 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. When Clara turns to the Doctor for help, she gets the shock of her life.