Jack Jameson and his robot buddy Danny One are off on another secret mission for Dr. Leopold Atkins, inventor of the famous, almost human, Atkins robots. This time Jack and Danny One are headed for the planet Janus, ruled by a twelve-year-old king, Paul IV. Dr. Atkins suspects foul play on Janus, masterminded by Paul's uncle, the duke.
The duke has ordered an Atkins robot made to look exactly like his nephew. But why would he want a mechanical look-alike for Paul? Dr. Atkins can think of a few reasons, and all of them spell trouble for the boy king. It is up to Danny One and Jack to find out what the evil duke is planning.