From the Radio Times:

5.40
DR. WHO
An adventure in space and time
starring
WILLIAM HARTNELL as Dr. Who
and
MAUREEN O'BRIEN, PETER PURVES

A Battle of Wits
by DENNIS SPOONER
with
Peter Butterworth
The Tardis disappears and an invasion begins.
Title music by RON GRAINER
and the BBC Radiophonic Workshop
Percussion played by
CHARLES BOTTERILL
Story editor, Donald Tosh
Designer, Barry Newbery
Producer, VERITY LAMBERT
† Directed by DOUGLASS CAMFIELD

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6.50pm
Doctor Who
The Time Meddler
A four-part classic sci-fi tale from 1965. Starring
William Hartnell
Maureen O'Brien
Peter Purves
3: A Battle of Wits.  The Tardis and the both disappear - but Vicki and Steven make some discoveries.
Producer Verity Lanbert
Director Douglas Camfield
(Black and white.  Rpt)
BBC VIDEOS: £10.99, from retailers.

This is the first mention of another person from the Doctor's home planet.