Tension between the Doctor's scientific rationalism and Sarah Jane Smith's emerging acceptance of supernatural explanations regarding the Metebelis spider threat

The Doctor provides his allies with crucial intelligence about the mind-amplifying crystal’s extraterrestrial origin, explaining its extraction from Metebelis Three and the ethical dangers of its power. Sarah presses for …

The Doctor and Sarah stand in the UNIT lab, the flawed crystal’s lingering distortions still clouding perception. As Sarah observes movement outside, the Doctor proposes a radical temporal theory—that the …