The night after a shooting star is seen streaking across the sky, a cylinder is discovered near London. Armed with just a white flag, the locals approach the mysterious object - only to be burned alive by heat-rays as horrific, tentacled invaders emerge. Soon, the whole of human civilization is under threat, as powerful Martians move across the land in massive killing machines, armed with black gas and burning rays. The aliens are determined to win the Earth for themselves.