For years, scientists have debated about how exactly human life started on Earth. Now, after a startling discovery, one such group of academics stand poised to unlock the secrets to mankind's origins.

This week, Paddy and Tricia follow The Doctor and Leela as they race against the clock to stop an ancient evil from accidentally being awakened. Will they be in time or will humanity be forced to evolve in the Image of the Fendahl?