Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"The Sea Devil attack on the submarine in Episode 12 (source) directly leads to the Doctor's intervention and arming of the crew (Ridgeway and Mitchell) in Episode 13 (target) as they are stranded below the Sea Devil base."
inferred by llm_cross_episode_character
Why This Matters Across Episodes
The longer arc this connection carries
The perilous breach of the submarine in Episode 12 creates the immediate circumstances for the Doctor to find Ridgeway and Mitchell trapped below the Sea Devil base in Episode 13. This action enables the Doctor's risky intervention to arm the crew, setting up the mutiny and escape sequence.
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.