Narrative Connection
How these two moments in the story relate
Why These Connect
The narrative assertion
"The Master's possession of Tremas (in 'The Keeper of Traken Part 4') directly enables his infiltration of the TARDIS in 'Logopolis Part 2', as the Doctor references the hijacked identity as the mechanism of infiltration."
inferred by llm_cross_episode_character
Why This Matters Across Episodes
The longer arc this connection carries
The Master's use of Tremas's body as a vessel in Episode 24 is the prerequisite condition for his later infiltration of the TARDIS via a second vessel (as explicitly mentioned in Episode 26). This creates a causal chain where the Master's earlier manipulation of Traken's leadership directly leads to the current crisis in Logopolis.
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.