Professor Kalu was a scientist who studied chronons. She and Christopher Jennings worked to develop a chronon bomb on Proxima for Earth Central, where she also managed to discover interstitial time, planning to use it to achieve evolutionary perfection. She was defeated by the Fifth Doctor, Tegan Jovanka, Nyssa, Marc and Jennings. (AUDIO: Interstitial [+]Loading...["Interstitial (audio story)"])