An experimental robot and a team of human experts are on the trail of a renegade robot that has broken itself down into six pieces and launched them into the past. The team must retrieve all the pieces before the human past—and its future—is changed. Original.

An experimental robot named Hunter and his team of human experts must find and disable the MC Governor robot, which is lost in an age of pirates and cutthroats, before it can destroy all humankind. Reprint.

Certain that its destruction is imminent, MC Governor, the largest and most intelligent experimental robot ever built, uses the Third Law of Robotics to break itself down into six smaller robots and scatter them throughout Earth's past. Reprint.

A robot named Hunter and a team of three human experts travel back into time to World War II to stop a time-traveling renegade robot before he destroys the future of humanity.

Attempting to recover the fifth component of a renegade robot, Hunter and his team travel through time to ancient China, where they are thwarted by Dr. Wayne Nystrom, creator of the robot, who is determined to retrieve it himself.

Attempting to capture the last component robot of a renegade inventor, R. Hunter and his companions travel to the time of King Arthur, and land in the middle of a crucial war between the Britons and the Saxons. Original.