Much like The Doctor and his companions, Eric and Dan go back in time to review the episode that started it all, "An Unearthly Child". This story begins in swinging (dark and foggy) London in 1963, where we meet stalking school teachers, an uncannily clever and manic teenager, and a man in a junkyard with something to hide -- from the cops. From there it's off to 100,000 BCE with a prehistoric power struggle and the quest for fire, which some say will destroy them all. Some say that over and over.