(The black hole's beam deposits the others in a quarry. And the other? Come on. SECOND DOCTOR: The invisible man. THIRD DOCTOR: Jo.
Plan: A: an artificial world; Q: What kind of world do the third Doctor and Jo find themselves on? A: the second Doctor; Q: Who tries to find a way to control the organism? Summary: The third Doctor and Jo find themselves on an artificial world inside the black hole while the second Doctor tries to find a way to control the organism.