F/X man Rollie Tyler is now a toymaker. Mike, the ex-husband of his girlfriend Kim, is a cop. He asks Rollie to help catch a killer. The operation goes well until some unknown man kills both the killer and Mike. Mike's boss, Silak says it was the killer who killed Mike but Rollie knows it wasn't. Obviously, Silak is involved with Mike's death, so he calls on Leo McCarthy, the cop from the last movie, who is now a P.I., for help and they discover it's not just Silak they have to worry about.

Humanity must resume its war against the Martians when they revive after decades of hibernation following their defeat in the 1950s. The fate of Earth may very well rest in the hands of a small yet courageous band: astrophysicist Harrison Blackwood, paraplegic computer wizard Norton Drake, microbiologist Suzanne McCullough and military man Paul Ironhorse.