From the Radio Times:

5.35 Colour: New series
Dr Who
starring Tom Baker
in Robot: a four-part story by TERRANCE DICKS
Part 1: The Doctor changes form again.  Before he has fully recovered, something of colossal strength steals a secret weapon, and the convalescent Doctor starts to investigate.
Incidental music by DUDLEY SIMPSON
Script editor ROBERT HOLMES
Designer IAN RAWNSLEY
Director CHRISTOPHER BARRY