CALDWELL: IMC - Interplanetary Mining Corporation. Look at it! More trouble? NORTON: Yes. The ROBOT waits in an alcove. The third Primitive starts to swing a stone on a rope and rushes at the DOCTOR.
Plan: A: The Doctor; Q: Who discovers an Interplanetary Mining Corporation ship has landed on the planet? A: its duralinium; Q: What is the Interplanetary Mining Corporation mining on the planet? A: the colony; Q: Where does Norton cause trouble? Summary: The Doctor discovers an Interplanetary Mining Corporation ship has landed on the planet in order to mine its duralinium, while Norton begins causing trouble at the colony.