(CARRINGTON continues to observe.) (The DOCTOR and the BRIGADIER return.) (The signal goes out.) LIZ: P...perhaps he sent it into the future? This is Recovery 7. UNIT HQ.
Plan: A: UNIT; Q: Who retrieves the returned Recovery 7? A: Carrington; Q: Who hijacks the recovered Recovery 7? A: the Doctor; Q: Who and Liz try to decode the signal Carrington sent? Summary: UNIT retrieve the returned Recovery 7 but then Carrington hijacks it while the Doctor and Liz try to decode the signal he sent.