Stephen Noonan

 voiced the First Doctor in several of The First Doctor Adventures audio stories. He also voiced several other characters for Big Finish Productions.

Credits
As the First Doctor

Once and Future

 * Past Lives
 * The Artist at the End of Time

The First Doctor Adventures

 * The Outlaws
 * The Outlaws
 * The Miniaturist
 * The Demon Song
 * The Demon Song
 * The Incherton Incident

Other Roles

The Third Doctor Adventures

 * Kaleidoscope - Solokov / Keith Hazel / Fairford / Phantom Pilot / Nanobots