Petra Williams

From TARDIS Index File, the free Doctor Who reference.

Petra Williams
Also known as:
Race:	Human
Home Planet:	Earth
Home Era:	1970s
Appearances:	DW: Inferno
Actor:	Sheila Dunn

Petra Williams was Professor Stahlman's assistant at the Inferno Project. At first loyal to her employer, Greg Sutton helped her realize how dangerous the project really was, and she helped the Doctor put an end to it. (DW: Inferno)

Following the shut down of the Inferno project she and Greg Sutton became lovers and planned to leave Great Britain. (MA: Who Killed Kennedy)