DOCTOR: To live, to grow. ELDRAD: Energy drawn from the core of the planet. I'm called the Doctor and this is Sarah Jane Smith. My gift to Kastria. Take me back through time. They tried to obliterate me.
Plan: A: Eldrad; Q: Who uses the energy from the reactor to regenerate herself? A: her; Q: What does Eldrad try to force the Doctor and Sarah to take back to Kastria? Summary: Eldrad uses the energy from the reactor to regenerate herself and tries to force the Doctor and Sarah to take her back to Kastria.