Vansom

 was a xenobiologist. She wanted to visit Telos before Parry. She was interested in the technology on the planet. She had created Cyberman-animal hybrids from the local fauna on Telos Minor. Upon seeing what the Cybermats did to Hopper's ship, she found them to be intriguing creatures. The Fifth Doctor peaked her curiosity. She had explored another cybertomb and learnt their technology. She knew who the Doctor was was from the file the Cybermen had on him. She ordered Nyssa and Parry into the cyberconversion unit to make it military-worthy to create advance soldiers. She was killed by the Cybermen. (AUDIO: Secrets of Telos)