Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"Sarah's discovery and killing of the Zygon replica in Episode 2 escalates the stakes by confirming the infiltration threat, which later forces the Doctor to split the team in Episode 4 to counter Zygon operatives posing as humans."
inferred by llm_cross_episode_arc
Why This Matters Across Episodes
The longer arc this connection carries
The loss of a human identity (Harry's replica) and the inherent uncertainty of identity (disguised Zygons) drive the Doctor's tactical response in Episode 4, elevating the conflict from localized infiltration to a systemic existential threat.
About Escalation Connections
B raises the stakes established in A. The conflict intensifies, the pressure increases, the consequences grow more severe. The ratchet tightens.