The supercomputer Spartacus has found a way to recover from every move Raymond Dyer and his team of scientists made to disable it, and now Spartacus is actually stronger than ever! Using its army of drone robots, Spartacus has tapped directly into the fusion reactor which powers the Janus space colony. The Marines are watching the drones, prepared to "neutralize" them. The man-machine conflict is primed and ready to blow . . .