And then the fog came down and it got cold all of a sudden. BEN: It's worse in the generator room, even with the boiler. DOCTOR: A lighthouse without a light. Electric shock. He died instantly. I'm something of an engineer myself. It's Reuben. LEELA: We came in the TARDIS. Our craft's parked on the other side of the island. What would spies want on Fang Rock? You should talk often with the old ones of the tribe.
Plan: A: an isolated rocky island lighthouse; Q: What is the TARDIS near? A: a comet; Q: What strikes the sea? A: the nearby sea; Q: What did the comet strike? A: electrical problems; Q: What problems does the generator have? A: one; Q: How many keepers die? A: Rueben; Q: Who is the eldest keeper? A: Fang Rock; Q: What is the name of the island? A: the Doctor; Q: Who suspects it's something worse than a legend? Summary: The TARDIS lands near an isolated rocky island lighthouse just after a comet strikes the nearby sea and a sudden chilling fog rolls in. Soon after, electrical problems take hold of the generator and one of the keepers dies mysteriously. Rueben, the eldest keeper, thinks it's the return of the legendary Beast of Fang Rock, but the Doctor suspects it's something worse that a legend.