Susan - a teenager purporting to be his granddaughter. She
left the Doctor to marry David, a member of the London resistance in
'The Dalek Invasion of Earth'.
Barbara Wright and Ian Chesterton, Susan's teachers
whilst she and the Doctor were on Earth. They leave the Doctor
at the end of 'The Chase' wherein it was found that the Daleks had
developed time travel technology, using that technology to return to
their home time.
Vicki is the sole survivor of a crashed spaceship from the
year 2493. She leaves the TARDIS when it lands outside the topless
towers of ancient Illium (Troy to you and me) where she falls in love
with Troilus and stays behind under the name of Cressida.
Steven Taylor - another marooned starfarer, he joins the
Doctor and Vicki a the end of 'The Chase'. Though initially sceptical of the Doctor's claims
(not helped by finding a modern wristwatch on a beach supposed to be
in 1066!), he became a trusted member of the team. He becomes the
leader of 'The Savages' after the Doctor and his colleagues destroy
the mind transference machinery used to keep the Elders in power.
Katarina, rescued from the wreckage of Troy by Steven, elects
to travel with him and the Doctor. She dies in sacrificing herself in
escaping from the Daleks in 'The Dalek Masterplan'.
Sarah Kingdom - a member of Earth's Security Forces. Initially
she is set upon the trail of the Doctor, Steven and Katarina when
they found out what the Traitor Mavic Chen was up to. Shown the proof
of the treachery after gunning down her brother in the subsequent
chase, she takes his place in keeping the heart of the Daleks' Time
Destructor away from them. Unfortunately, she dies when the weapon is
activated.
Dodo Chaplet was picked up off the streets of London after an
adventure back in the time of the Huguenot Persecutions in 16th
century Paris involving her many times great grandmother. She stayed
with the Doctor until they had cleared up the effects of WOTAN in
'The War Machines'.
Ben Jackson and Polly (no surname officially recorded)
join the Doctor after being caught up in the WOTAN conspiracy.
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