Pay the Piper

The Eleventh Doctor and Clara Oswald have arrived at the Temple of Infinite Profit on the Seventh Moon of Koth, maintained by the money-worshipping religious order known as the Mandalax Tide. This religious order has a collection plate the size of Birmingham, and it has acquired a Matter Translation Portal. On the psychic paper, the Doctor has received a message from the other side of the portal reading, "Have you heard the Piper pay?" Sensing the fear and desperation in the message, he and Clara enter the portal.