(To LIZ.) Destroy the Van Allen belt. Now! YOUNG SILURIAN: (To the DOCTOR.)
Plan: A: Liz; Q: Who distributes the cure to the virus? A: the Doctor; Q: Who discovers the Silurians' plan? A: the Van Allen Belt; Q: What do the Silurians plan to destroy? Summary: While Liz distributes the cure to the virus, the Doctor discovers the Silurians now plan to wipe out humanity by destroying the Van Allen Belt.