The Nimons' systematic conquest of Skonnos through manipulation, tribute, and forced migration via a hyperspace tunnel

The Nimon enforces its demand for Anethan crystals, a tributary act that underscores the alien’s predatory control. Amid the young people’s submission, the tribute flows into the mechanism, causing gauges …

As the Nimon's force grows with fresh arrivals, the Doctor deciphers the fatal flaw in their hyperspace tunnel scheme—two black holes powering a spatial gateway. Romana moves to sabotage the …