The ninth series of Doctor Who continues tonight at 8:25pm on BBC One and BBC One HD, read on for the synopsis to the fourth episode:
BEFORE THE FLOOD - by Toby Whithouse
On a remote Army outpost, a fearsome alien warlord - the Fisher King - sets in motion a twisted plan to ensure his own survival. The ripples will be felt around the universe. Is this chain of events inevitable? And can the Doctor do the unthinkable?
The series continues next Saturday at 8:20pm with The Girl Who Died, more details coming then.