Before the fall of Project: Rassilon, the Regenerators of Gallifrey committed atrocities upon their slaves in the name of science. As Leela discovers the results of one such crucible, Romana and Narvin are pushing forward ways to discover the secrets of time travel, and jump-start their new Gallifrey's evolution. However, science isn't always the way forward, and in a society built upon the foundations of amorality and fear, a backward step may be the only solution...