Check out a new preview clip above for the next episode of Doctor Who "Under The Lake."
Clara is on the run and being chased by...ghosts?
Doctor Who airs Saturdays on BBCA starring Peter Capaldi and Jenna Coleman.
Under The Lake synopsis:
When an underwater base comes under attack, the Doctor and Clara must save the frightened crew and defeat an impossible threat. But what is behind these terrifying events? And can they really be haunted by ghosts?