Nicola Savage

Nicola Savage was the scientist in charge of finding out what happened on Chronos. She didn't like the Sixth Doctor being called in to be part of her team. She fell though a portal after a door opened. She was converted into a Cyberman. She wanted to bring the Doctor to the Cyber-Controller. She used her transponder to spy on her other humans. She used Evelyn Smythe as a bargaining chip.

_{Biography from the TARDIS Data Core article, licensed under CC-BY-SA}