Rodan

Rodan was a female Time Lord who worked as a controller on Gallifrey. She befriended Leela and worked with her in order to help the Doctor defeat a Sontaran invasion of Gallifrey. (DW: The Invasion of Time)

Behind the scenes

 * Rodan is the first female Gallifreyan other than Susan Foreman seen on screen, predating the introduction of Romana.