(He grins even wider and starts rummaging in his pocket.) Back to the Doctor and Sarah running. CRAYFORD: All...units. Perhaps by design!
Plan: A: The Doctor; Q: Who suspects Crayford brought something to Earth? A: his rocket; Q: Where did Crayford bring something to Earth? A: Sarah; Q: Who is with the Doctor when he is being hunted by UNIT? Summary: The Doctor suspects Crayford brought something to Earth in his rocket, as he and Sarah find themselves hunted by UNIT.