The Terraphiles are a group obsessed with Earth's past and dedicated to re-enacting ancient sporting events. The Doctor and Amy join them on a trip to Miggea, a star on the very edge of reality, and venue for a competition to win the fabled Arrow of Law. But the Terraphiles' grasp of Earth history and customs is dubious to say the least, and just getting to Miggea is going to prove tricky.