In the future, the inmates of a private underground prison are computer-controlled with cameras, dream readers, and devices that can cause pain or death. John and his illegally pregnant wife Karen are locked inside "The Fortress" but are determined to escape before the birth of their baby.

7 years on from the original Fortress movie, Brennick and his family are still on the run. Finally, they give in, and surrender, only to find themselves imprisoned in a new, more sophisticated fortress prison in outer space. But Brennick's not a man to give in easily, and with a 10 year old son waiting for him back on earth, he's going to pack some serious assault on the evil corporation.