Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"The Doctor's examination of the energy residue (Ep. 17) leads to his understanding of the seismic control center's layout and function, enabling him to stabilize Sarn's eruption in Ep. 18. His knowledge of the gas's properties directly informs his ability to intervene at the seismic level."
inferred by llm_cross_episode_arc
Why This Matters Across Episodes
The longer arc this connection carries
This connection shows the Doctor's deductive reasoning spanning episodes: his forensic analysis of the residue unlocks the means to counter the Master's plan (gas-fueled genocide) and save Sarn.
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.