With Nyssa from Traken unexpectedly rejoining the group, Adric aids the Monitor of Logopolis in trying to save the Doctor before time runs out. The Master, at liberty to prepare, is finally ready to reveal his true target, which unknowingly sets off the biggest catastrophe of all time.
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Logopolis is not the universe.
But it is. Logopolis is the keystone. If you destroy Logopolis, you unravel the whole causal nexus.
"Causal nexus" - you insult my intelligence.
Featured in A New Body at Last