Doctor Who’s current companion Clara is working as a school teacher in England and the Doctor has told one of her tenth graders, Courtney, that she is not special. To give the girl some sense of specialness he takes her to the moon where he, Clara, and Courtney meet a team of American astronauts. The Tardis has appeared in the American spaceship, so the Tardis trio plus the leader of the American group are exiting the ship to step onto the moon for their first time.
Courtney: One small step for a thing; one enormous thing for a thingy thing.
Astronaut leader to Clara: Well, so much for History.