Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor halts TARDIS departure to confront paradox
S20E12
·
Mawdryn Undead Part 4
To
Companions revert as time spirals out of control
S20E12
·
Mawdryn Undead Part 4
Why These Connect
The narrative assertion
"The Doctor's urgency to escape in the TARDIS (Act 1) leads to the rapid aging of Nyssa and Tegan (Act 2), as they were contaminated by Mawdryn when they carried him into the TARDIS."
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.