May 24, 2013
Fun with Stats: Who's the longest-running companion?
As with the Doctors, I've looked at who's the longest-running companion by three measures. Firstly, by the number of serials or stories they appeared in. Secondly, by the actual number of episodes they appeared in. Finally, the time in days between their first appearance and their last appearance. A few notes: I have not included return appearances for companions prior or subsequent to their initial departure from the series; one-episode companions like Grace Holloway or Wilf have been excluded; for Nyssa I have included her guest appearance in "The Keeper of Traken" for her total; I have separated both Romana and K9 into two separate characters each.
So: who is Doctor Who's longest-running companion?
So there's your answer, or to be more specific, there are your answers: it's Amy Pond, Jamie McCrimmon or Tegan Jovanka.
That said, I'm sure if I added in the companions' appearances in novels and audio dramas, we might get even more candidates again.