When the alien energy-creatures came to Earth in 1970, mankind tried every weapon it knew against their attack - but how can you battle beings with enormous power and no solidity? Within a few short years, all of Earth was controlled by the Masters, who reared men as their pets and playthings. Then, suddenly, during a period of unusual sunspot activity, a huge solar prominence erupted, and the energy from that awesome explosion short-circuited the Masters. Temporarily, humanity was free to throw off its Leash and mount one last frantic attack on its overlords...