Earth's Space Tracking Stations have detected several giant man-made space objects in the moon's shadow. Specially created international units of COBRA are preparing to welcome the intruders. COBRA fighters not only intercept alien scouts, but also collect and study alien artifacts, creating their own samples of offensive weapons and defense systems based on them. Will the brave defenders of Earth have enough time and strength to prevent an attempted alien invasion? Time is counting down! —description from the publisher

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