The TARDIS lands on Earth in the year 2395. Ellie steps out of the TARDIS, but the doors slam shut before the DOctor and Amy can get out. The TARDIS dematerialises and lands on Zeanus shortly after an attack by the legendary A' Lokai. The Doctor and Amy, along with a troop of soldiers, venture into the nearby Tunnels of Blood. Can they stop this supposed immortal creature before it's too late?