1st August 1964: broadcast of "A Deperate Venture", the sixth and final episode of the series we now call The Sensorites. Barbara reappears (after several weeks' holiday) and sorts out the Sensorites; meanwhile the Doctor and Ian have tracked down the deranged astronauts in the tunnels. So everyone's a winner! Except the Second Elder and the Engineer, of course. This is the episode where Susan says, of her home planet,
at night the sky is a burnt orange, and the leaves on the trees a bright silver.Ends on a dramatically sour note as the Doctor takes offence at Ian and promises to put him and Barbara off at the next landing.