Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Leela confronts Nucleus agent Lowe at airlock
S15E6
·
The Invisible Enemy Part 2
To
Doctor exposed as virus carrier saves TARDIS
S15E6
·
The Invisible Enemy Part 2
Why These Connect
The narrative assertion
"Lowe's revelation of his allegiance to the Nucleus in the Titan Base airlock directly leads to his later identification as a carrier by the Doctor and K9 in the Isolation Ward. Lowe's duplicitous behavior at Titan Base plants the seed for his eventual exposure at the Foundation."
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.