(There is a loud explosion and the DOCTOR stumbles out of the TARDIS followed by a cloud of smoke. Curiosity is his weakness. DOCTOR: Well that's the Nestene energy unit! McDERMOTT: Who? Some kind of sabotage at a Radio Telescope. TIME LORD: The Master. Well, what is a Nestene?
Plan: A: Nestene Energy Unit; Q: What is stolen? A: a radio telescope; Q: What is sabotaged? A: the Doctor; Q: Who is contacted by a Time Lord who tells him his old rival the Master is responsible? Summary: When a Nestene Energy Unit is stolen and a radio telescope sabotaged, the Doctor is contacted by a Time Lord who tells him his old rival the Master is responsible.