Zeno visited Nateus on the orders of the War Council. She was fascinated by the Trell and tested Sholan on his knowledge. She wanted to take the Trell off world. She wanted to use the Trell to cloak a Time Lord fleet against the Daleks. She was forced to relive her mission over and over again. When Leela changed the timelines she was ordered to destroy the Trell to stop them coming into the hands of the Daleks. (AUDIO: Mother Tongue)