(The two SILURIANS step forward and drag the corpse of the Old Silurian leader from the control room. (To HAWKINS.) FIRST TECHNICIAN: (To the DOCTOR.) His face! The BRIGADIER and LIZ approach. They may even develop a cure. YOUNG SILURIAN: Look!
Plan: A: the virus; Q: What are the Doctor and Liz trying to find a cure for? A: Baker; Q: Who spread the virus? A: the Young Silurian; Q: Who kills the Old Silurian? A: control; Q: What does the Young Silurian take of his people? Summary: While the Doctor and Liz try to find a cure to the virus spread by Baker, the Young Silurian kills the Old Silurian and takes control of his people.