The Fourth Doctor's hidden investigation and moral dilemma regarding an emergent supernatural threat (the Beast) within the lighthouse, hidden from the survivors due to fear of panic

Reuben issues a sharp command to maintain the siren’s wail, his voice laced with urgency and fear as the unseen green creature’s presence grows near outside the lighthouse. Leela obeys …

The tense calm shatters when the shoreline rocks suddenly erupt from below with an eerie green glow. The Doctor’s earlier theory that the creature is deliberately intelligent now aligns with …