Susie Emmett

 voiced several characters for Big Finish Productions, most notably the Ravenous in several stories with the Eighth Doctor.

Ravenous
As Ravenous
 * Deeptime Frontier - Brallix
 * The Odds Against - Computers / Robots
 * Planet of Dust
 * Day of the Master - Kolstani 2 / Valcon

The First Doctor Adventures

 * Tick-Tock World - Katta
 * For the Glory of Urth - Sissy Cruciatu

UNIT: Nemesis

 * Ten Minutes in Hell - Warrell

Gallifrey

 * Beyond - Zara