Planet (The Monsters of Coal Hill School)
From Tardis Wiki, the free Doctor Who reference
A species not native to Earth produced a replica of Coal Hill School on another planet. There they hoped to learn about the Earth prior to invasion. Clara Oswald and Jeff Delobel found themselves teaching on the planet. They were taken home by the Twelfth Doctor, who put a stop to the learning. (COMIC: The Monsters of Coal Hill School)
