On the Moon, the Doctor is captured by the Ice Warriors and learns that they intend to use T-Mat to spread a deadly fungus across the world.
Returning to the Moonbase, the Doctor confronts Slaar and the remaining Ice Warriors and must find a way of deflecting the invasion fleet that is heading towards them.
An Ice Warrior invasion fleet is on its way to the Moon. Back on Earth, the Doctor devises a plan to destroy the Martian fungus.
In a spoof of the 1967 British TV series The Prisoner, Tara finds herself trapped in a posh prison without bars or guards, which, on the surface, appears to be merely an elegant hotel...
