After two-parter The Magician's Apprentice and The Witch's Familiar kicked the latest season off with a bang, this week sees Doctor Who move back into more familiar territory with a good old fashioned "base under siege" story. Under the Lake was written by Being Human writer Toby Whithouse , who's previous forays on Who include the episodes School Reunion , Vampires of Venice , The God Complex and A Town Called Mercy . Certainly an interesting resume, which quite a variety of episodes. School Reunion however happens to be a particular favourite of mine.