Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"Tegan's use of the phosphor lamp in Frontios Part 3 to repel the Tractators (freeing the Doctor and Norna) sets up Norna's subsequent forced confrontation with a Tractator in Frontios Part 4. The lamp's repellent properties against Tractators are demonstrated early, enabling Norna's later struggle."
inferred by llm_cross_episode_character
Why This Matters Across Episodes
The longer arc this connection carries
This establishes a persistent trait of the Tractator Collective: their vulnerability to the Doctor's and companions' improvised defenses (phosphor lamp). The event in Part 3 directly enables Norna's physical encounter with a Tractator entity in Part 4, deepening the threat level and continuity of the alien menace.
About Causal Connections
A directly causes B. The first event sets forces in motion that produce the second. These are the load-bearing connections of plot--remove one and the story structure collapses.