(All over the floor in a twisted, snake-like fashion is a series of triangles lit up in different colors. An impossible chance. But we won his games. CELESTIAL TOYMAKER: (To THE DOCTOR.) Hoorah for me! PLAY!
Plan: A: a strange domain; Q: What kind of domain do the travelers arrive in? A: an enigmatic, immortal entity; Q: What is the Celestial Toymaker? A: all eternity; Q: If the travellers fail at the games, they will be the Celestial Toymaker's playthings for how long? Summary: The travellers arrive in a strange domain presided over by the Celestial Toymaker - an enigmatic, immortal entity who forces them to play a series of games, failure at which will render them his playthings for all eternity.