The Sleeping Blood (audio story)

 written by Martin Day was the first story in the 2015 Companion Chronicles audio box set The First Doctor: Volume One. It featured Susan. This was a rare example of a First Doctor-lite story, set before any other companions joined the Doctor. This unique setting gave Susan the kind of spotlight she had never enjoyed on-screen.

Publisher's summary
When the Doctor falls ill, Susan is forced to leave the safety of the TARDIS behind. Exploring a disused research centre in search of medical supplies, she becomes embroiled in the deadly plans of a terrorist holding an entire world to ransom — and the soldier sent to stop him.

The Sleeping Blood (1)
to be added

The Butcher's Citadel (2)
to be added

Cast

 * Susan - Carole Ann Ford
 * Kendrick/The Butcher - Darren Strange
 * Ian Atkins (uncredited)

Continuity

 * Susan refers to her and the Doctor's departure from Gallifrey. (TV: An Unearthly Child, The Name of the Doctor; AUDIO: The Beginning)
 * Susan refers to the Mary Celeste. The Doctor would later be indirectly responsible for the disappearance of its crew in 1872. (TV: The Chase)
 * The Doctor tells Susan that they must not interfere with the affairs of other races, echoing one of the main precepts of Time Lord society. (TV: The War Games)