Prologue: The Third Doctor was one of several prologues to the miniseries Supremacy of the Cybermen, published by Titan Comics.
In a scientific laboratory, the Third Doctor is fighting against the Master, when the Doctor is suddenly hit by a time distortion. Believing it to be a trick caused by the Master, he turns around to see his enemy being cyber-converted.
- This story was published in 12DY2 8.
- The Master appears to be converted into a model similar to the Cybermen that appeared in Revenge of the Cybermen.
- The version of the Master depicted never encountered the Cybermen in televised Doctor Who. Neither had the Third Doctor in his own era with the exception of Carnival of Monsters.