One Fateful Knight (short story)

One Fateful Knight was the second short story in the Short Trips anthology Short Trips: The Quality of Leadership. It was written by Peter David. It featured the Eighth Doctor.

Summary
The Doctor travels to Arthur's World to aid in his birth; the Doctor used the alias Merlin but discovered that he was the second person at the time to use the name Merlin. The other Merlin was another renegade Time Lord who had given Arthur and his kingdom advanced technology and prompted Morgaine to seek an alliance with them. This other Merlin, disguised as the Doctor, was imprisoned in the Arctic by Morgaine after she was temporarily banished to a desert by the Doctor, leaving the Doctor to set up the events that would later be experienced by his seventh incarnation.

Characters

 * Eighth Doctor
 * Merlin
 * Morgaine
 * Queen Ignerna
 * Queen Guinevere
 * Uther Pendragon
 * Arthur Rex
 * Ancelyn

Continuity

 * The Doctor calls himself Merlin and creates messages for his past self. He receives the messages in TV: Battlefield.