In this epic concluding series, Captain Jet Morgan, Doc Matthews, engineer Mitch Mitchell, and radio operator Lemmy Barnet once more set out for Mars, but this time alone. Their orders: to discover all they can about the threatened Martian invasion of Britain. Jet and his comrades are stretched to their limits as they taken on the awesome Martian power. When they learn the astounding secret of the invasion plan, there is a race against time to warn a defenceless Earth. This is the complete The World in Peril series.