It starred Hammer Horror stalwart Peter Cushing as Doctor Who (not 'The Doctor') and Roberta Tovey as his granddaughter Susan (considerably younger than Carole Ann Ford's TV version). There was also a new character, a grown-up niece called Louise (Jill Curzon) and comic relief from Bernard Cribbens as policeman Tom Campbell. Some forty years later Cribbens, of course, would play Donna's grandfather in series 4 (2008) of the new series. Cushing is often airbrushed out of Doctor Who history as his films are not strictly canonical. It's true that they were remakes of Hartnell's first two Dalek stories. And it's also true that the TARDIS interior had to be changed because the BBC held the copyright on the familiar console design. But Cushing did much to promote the TV series and his films deserve to be celebrated nowadays, even if they did get a frosty reception from film critics.
It's always fascinating to watch old films and TV series as you get a sense of the era in which they were made. The cars, the fashions, the hairstyles, the music soundtrack and even the language all help to date a film. What's curious about this film was the utter lack of any attempt to predict what London would look like in the year 2150AD. Whether through laziness or budget constraints, our future capital looks suspiciously like 1967 with crappy old Bedford vans and banners advertising Castrol motor oil.