Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"The Doctor's observation of the Second Elder receiving a cryptic key (Episode 35) leads directly to the confrontation with the paranoid spaceship survivors (Episode 36), as the survivors are revealed to be the true instigators of the poisonings."
inferred by llm_cross_episode_character
Why This Matters Across Episodes
The longer arc this connection carries
The key exchange witnessed by the Doctor in Episode 35 is a critical clue that sets the stage for the revelation in Episode 36 that the poisoners are not the Sensorites but the spaceship survivors. The Doctor's suspicion of the key exchange thus drives the plot forward into the next episode, where the true enemy is unmasked.
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.