Mysterious packages containing advanced scientific knowledge drive physicist Burke and three companions to build a spacecraft and investigate a strange wailing sound emanating from an asteroid. Upon reaching the massive space rock, they discover it is an artificial fortress left by an ancient, long-extinct alien civilization. The eerie signal is a warning: a hostile race that destroyed the fortress builders is now approaching, intent on annihilating humanity. Racing against time, the four explorers must unlock the secrets of the dormant technology within the asteroid and find a way to repel the impending alien invasion before Earth is destroyed forever.
