Elizabeth Rider (sometimes credited as Elizabeth Ryder) portrayed Ellen in the The Sarah Jane Adventures television story Lost in Time, and voiced the ATMOS GPS in the Doctor Who television story The Sontaran Stratagem/The Poison Sky. She later played Linda in The Time of the Doctor.
For Big Finish Productions, she voiced Galatea in The Well-Mannered War.
She was interviewed on the Behind the Lens episode The Time of the Doctor: Behind the Lens.