In the year 2100, mankind on Earth, settlers in a lunar colony and
aliens from the para-universe, a strange universe parallel in time
to our own, are faced with a race against time to prevent total
destruction of the Earth. The invention of the Inter-Universe
Electron Pump has threatened the rate of hydrogen fusion in the
sun, leading, inevitably, to the possibilty of a vast explosion --
and the vapourisation of the Earth exactly eight minutes later ...