Others in this book. The sixth book, Norby Finds a Villain introduces the character of Threezey the Clown, the alter ego of Ing. In this book, Ing/Threezey kidnaps Pera at a magic show and tries to use her to create a superbomb that will leave him as the only thing left in the universe. He instead opens a portal to another reality where the tree-like Master Cult (MC) rule, and accidentally bring them to the Solar System where they proceed to conquer Earth. In the seventh book, Norby Down to Earth, Norby learns about his origins as well as the fate of the spacer McGillicuddy, who converted him to his current form. The eighth book, Norby and Yobo's Great Adventure, finds Norby and Jeff stranded in ancient Africa with Admiral Yobo. The ninth book, Norby and the Oldest Dragon, takes place almost entirely on the planet Jamya, which is being menaced by an attack from an intelligent cloud. The dragon in the title refers to the Dowager Dragon, mother of the Grand Dragon (the current ruler of Jamya). The tenth book, Norby and the Court Jester, is set once more on the planet Izz and brings back the villain Ing for a third appearance. The final book in the series, Norby and the Terrified Taxi, centers around Lizzie, an intelligent taxi first introduced in Norby Down to Earth. They must find and stop Garc the Great who wants to change history. Recurring characters Jefferson "Jeff" Wells: A 14-year-old cadet in the Space Academy, Jeff is Norby's "owner" and partner. Jeff originally purchases Norby, with the help of a loan from Admiral Yobo, to learn Martian Swahili for a class (Norby, the Mixed-Up Robot). His brother Fargo serves as his guardian, as their parents died when Jeff was only 10. Farley Gordon "Fargo" Wells: a secret agent for Admiral Boris Yobo of Space Command. Handsome, charming, musical, and a bit arrogant, he dates Albany Jones in the first book, and married her in later novels. Fargo is ten years older than Jeff and serves as his guardian. Admiral Boris Yobo: Jeff's commanding officer and Fargo's boss, Yobo has a big appetite for adventure and a larger one for food. Yobo originally gave Jeff the money to buy Norby from a used robot shop. Due to his high rank in Space Command, Yobo tends to become a quasi-liaison to whatever world Norby