Moonbase. HOBSON: Out. Come and see. There is a spaceship approaching from Earth. Oh I see, the Cybermen. He could flood half of Europe if he keeps the gravitron aligned with spring tides. (HOBSON and the DOCTOR try to lift it from the front.)
Plan: A: Cybermen; Q: Who is preparing to launch a full attack on the Moonbase? A: their hands; Q: Where must the Moonbase and Gravitron be kept out of? A: help; Q: What must the Doctor and his friends wait for from Earth? Summary: With the Cybermen preparing to launch a full attack, the Doctor and his friends must keep the Moonbase and the Gravitron out of their hands until help arrives from Earth.