Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"The Master's escape from Castrovalva (Episode 4) directly leads him to confront the Doctor in Episode 25 to demand the TARDIS key."
inferred by llm_cross_episode_character
Why This Matters Across Episodes
The longer arc this connection carries
The ending of Episode 4 shows the Master's retreat—but his pursuit of the Doctor's TARDIS and its key (Episode 25) is a direct continuation of his failed plan. The Master’s need for a functioning TARDIS (after being trapped in Castrovalva) drives him to threaten the Doctor again.
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.