The Daleks are developing a secret weapon on Asteroid Theta 12. It is imperative that their plans are uncovered.

Cardinal Ollistra has her hands full studying the range of ancient and mysterious armaments the universe has to offer, but she makes it a personal mission to investigate the Dalek project.

On this dangerous assignment, there is one particular Time Lord she wants at her side - and he will be accompanying her whether he wants to or not.