Cyclops

The plural of Cyclops was Cyclopes, and it was these giant, one-eyed creatures, found on Earth in the times of ancient Greece and briefly encountered by the Eleventh Doctor and companions Amy Pond and Rory Williams, which inspired the tales of the Greek heroes, as recorded in epic poems of the time. (COMIC: Island of the Cyclopes)

The First Doctor encountered a cyclops named Fo on the planet Rhoos. (PROSE: The Playthings of Fo)