Despite being told to remain in outer space, the crew of the shadowy Aquarius 7 mission return to Earth, necessitating action by the Omega Agency. Capt. Nicholas Saxon (Jack Scalia) has his orders: to subdue or eliminate the Aquarius 7 astronauts, who have been infected by a reptile-based organism of extraterrestrial origin. As a result of the aliens' control over them, the flight crew has brought back eggs that, if allowed to hatch, could help spread the infection across the entire planet.