The Piper (short story)

The Piper was the twelfth short story of The Scientific Secrets of Doctor Who, featuring the Third Doctor.

Summary
to be added

Characters

 * Third Doctor
 * Jo Grant
 * Alistair Gordon Lethbridge-Stewart
 * John Benton

Continuity

 * The Doctor says that the Cyberman survived a previous invasion attempt. (TV: The Invasion)