Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"The Doctor's urgency to locate Romana via K9 (tracking from Part 2) directly motivates the search into Vivien Fay's cellar and the discovery of the Cailleach's ancient identity in Part 3."
inferred by llm_cross_episode_character
Why This Matters Across Episodes
The longer arc this connection carries
The Doctor's commanding K9 to track Romana (Part 2) establishes his relentless drive to resolve Romana's disappearance, which propels him into Part 3's cellar scene where Vivien Fay's identity as the Cailleach is uncovered. The urgency from Part 2's conflict carries forward as the central mission for Part 3.
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.