In 2022, Captain Robbins (Liotta) has been banished to a prison colony island inhabited by the most dangerous criminals. With no walls and no guards, the prisoners are left to kill each other. Then Robbins discovers a relatively peaceful community of prisoners who help each other. But this group is soon bedeviled by the evil nasties on the other side of the island. Attempts at escape define the plot, so the film is filled with superhuman feats of sheer courage, determination, and guts. Adapted from the book "The Penal Colony" by Richard Herley.