250px-Celestial Toymaker

I'm bored. I love to play games but there's no-one to play against. The beings who call here have no minds, and so they become my toys. But you will become my perpetual opponent. We shall play endless games together, your brain against mine.
~ The Celestial Toymaker

The Celestial Toymaker (often shortened to The Toymaker) is a vastly powerful cosmic entity and antagonist from Doctor Who, even in a franchise known for extensive use of time-travel and other godlike powers the Celestial Toymaker was portrayed as a near-omnipotent alien who had nothing short of his own personal universe by which to play with.

However like many omnipotent beings in fiction the Celestial Toymaker finds his godlike state to be boring and thus forces the Doctor and his companions to endure several sadistic and potentially fatal "games" for his own amusement.