Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"Zaroff's mention in Episode 19 as the source of the plankton-based food (and thus, implied controller of Atlantis' survival) is revisited when he reveals his apocalyptic plan to drain the ocean in Episode 20."
inferred by llm_cross_episode_arc
Why This Matters Across Episodes
The longer arc this connection carries
The Doctor's early reference to Zaroff as a shadowy scientific figure evolves into Zaroff's open declaration of godlike ambition—this callback deepens the menace of his character.
About Callback Connections
B explicitly references A. A later moment deliberately echoes an earlier one, creating a sense of narrative completeness and rewarding memory.