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. Written by
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Logopolis is a cold place... a cold high place overlooking the universe. It holds a single great secret, Nyssa, which you and I must discover together.
Featured in A New Body at Last