Mula's cultural prejudice against the Mentiads vs. the alliance forming between different species against the Captain

Mula’s deep-seated prejudice against the Mentiads clashes with K9’s revelation that the Doctor has chosen to trust them. K9’s calm assertion that his own analysis detected no malice forces Mula …

The Doctor shatters the Mentiads' confusion by exposing Zanak as a hollow planet hijacked by vast transmat engines that expropriate other worlds’ matter and energy. Romana clarifies each step of …