When an earthquake threatens the stability of an underground Russian nuclear installation, Steve must rescue the fiance of his friend Col. Vasily Zhukov, who is buried beneath debris. Complicating matters further, Steve must also stop the reactor before it explodes.

When an object tracks across the sky and lands in a remote area in Wyoming, Oscar and Steve arrive on the scene and find that a Russian space probe built to withstand the extreme Venus environment has crash landed on earth and is out of Soviet control. It's up to Steve to try to stop the probe from destroying a nearby town.

With time running out, Steve must do anything he can to disable the Russian space probe in spite of the fact that it is virtually indestructible and has numerous inventive capabilities that it uses as weapons.