So who is the Fisher King? And that rock theme at the beginning…

Watched on Netflix.

Doctor Who S09E04: Before The Flood from IMDb
In a town that never was, the Doctor and his friends are being stalked by a mysterious figure. With the past and future in the balance, can the Doctor stop the evil Fisher King? And more importantly, who composed Beethoven's 5th.

So do ghosts exists? The Doctor investigates…

Watched on Netflix.

Doctor Who S09E03 : Under The Lake from IMDb
Under a lake a gleaming black spaceship is recovered but there is nothing inside. When the base crew start dying, they discover that ghosts are real. The Doctor and Clara arrive to find the base under siege and the Doctor discovers that this is more than a ghost story.