Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"The sabotage of the transmat system (removal of the pentalium drive) (Episode 18) enables the Cybermen's plan to use the Doctor and companions as bomb carriers (Episode 19)."
inferred by llm_cross_episode_character
Why This Matters Across Episodes
The longer arc this connection carries
The Doctor's discovery of Kellman's sabotage (which stranded Sarah and Harry on Voga) is directly exploited by the Cyber Leader, who uses the Doctor's companions as unwitting carriers of cyberbombs. The sabotage thus enables the Cybermen's genocidal plan.
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.