He crosses to Irongron's Spaceship and looks inside. IRONGRON'S CASTLE. Linx is stood over him, covering him with his weapon. Miss Smith. The DOCTOR examines the rifles.)
Plan: A: The Doctor; Q: Who tracks the missing scientists to Irongron's castle? A: Linx; Q: Who is using the scientists to repair his spaceship? A: advanced weapons; Q: What is Linx using the scientists to construct? Summary: The Doctor tracks the missing scientists to Irongron's castle, where Linx is using them to repair his spaceship and construct advanced weapons for Irongron.