What Ever Happened to Baby Jane in Space Orbit

Series D, Episode 11. First broadcast on Monday 7 December 1981.

Will Si, Nathan, Peter and Simon be able to escape with the Tachyon Funnel and their lives? Will their replica of Orac give more information than requested, less information than requested or just the information that’s requested? And which of the crew weighs 73 kilos?

Escape velocity is confirmed — but unattainable. Will they be able to achieve Orbit?