sentences:  Throughout Zanak, the Key to Time locator has been giving odd signals that seem to indicate that the segment is everywhere.Once the Doctor and Romana see the Captain's trophy room of planets, they conclude that Calufrax is the segment that they are looking for.The Captain's plan is to use the gravitational power of all the crushed worlds to essentially drill a hole through the time dams, bypass its fail-safe mechanism, and let time move forward so the queen dies.