Therefore, its known narrative elements are not a part of the Doctor Who universe. It may have been the basis for a similar story in another medium, however — and that story may indeed be a part of the DWU.
The Ice Warriors, led by Commander Kulvis, plan to invade modern-day Earth using a weapon called the "Z" beam, which is capable of freezing anything it touches to absolute zero. In particular, the Ice Warriors can use it to freeze a humanbrain, turning the afflicted individual into a subservient Brain-Dead. The Ice Warriors hijack a communications satellite and use it to take over the crew of its receiving station, whom they set to work constructing a giant "Z" beam transmitter. They plan to use the satellite network to broadcast the "Z" beam around the world, enslaving mankind and adjusting the Earth's climate to something suitable for Martian habitation. Realising that metals are extremely conductive at absolute zero, the Third Doctor overloads the "Z" beam transmitter just at the point of broadcast, destroying the Ice Warriors and the Brain-Dead. (REF: The Seventies)