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

Checkmate
by DENNIS SPOONER
with Peter Butterworth
The course of history is to change.  The Doctor takes command.
Title music by RON GRAINER
and the BBC Radiophonic Workshop
Percussion played by
CHARLES BOTTERILL
Costumes supervised by Daphne Dare
Make-up supervised by
Sonia Markham
Lighting, Ralph Walton
Sound, Ray Angel
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
Last in a four-part classic sci-fi tale from 1965, written by Dennis Spooner. Starring
William Hartnell
Maureen O'Brien
Peter Purves
Checkmate.  The extent of the time meddler's plans are revealed.
Producer Verity Lanbert
Director Douglas Camfield
(Black and white.  Rpt)

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