Sadly, due to missing episodes, there is very limited footage of two of the Doctor's early companions -- Katarina of Troy and Sara Kingdom. Though both had only a brief tenure in the TARDIS (5 and 6 episodes respectively), they were both very important and notable. And both had very tragic endings that make them memorable, even if said endings are no longer available to be seen. I heartily encourage everyone to check out the transcripts and audio recordings that are left, and to see the one remaining episode of Katarina and the 3 surviving eps of Sara's. They're brilliant.

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