Abby, originally named Amy, is a fictional character played by Ciara Janson in a series of audio plays produced by Big Finish Productions based on the long-running British science fiction television series Doctor Who. A human "tracer", a device designed to track down the segments of the Key to Time, she is a companion of the Fifth Doctor. After her travels with the Doctor, Abby, alongside her sister Zara, would return in their own audio series, Graceless.