Jeff and his mixed-up robot, Norby, get involved in new adventures on a strange planet.

This fourth volume of the complete children’s sci-fi series includes a mission to foil evildoing aliens and a quick trip to eighteenth-century France. Norby and the Invaders Jeff Wells and his robot, Norby, must rescue the Grand Dragon of Jamya from strange, blimplike aliens known as the Hleno. Determined to protect the environment from the overuse of technology, the Hleno take Norby and Jeff prisoner, too. Encased in an impenetrable plastic bubble, Norby is helpless. And without Norby, Jeff is lost in outer space. Norby and the Queen’s Necklace Sent to 1785, France, Jeff and Norby get mixed up with an extravagant necklace intended for Marie Antoinette—and accidentally alter events that led to the French Revolution. Now they must shuttle back and forth through time and space to set world history straight.

Jeff Wells purchases a used robot named Norby to help him improve his grades at the Space Academy, but learns that Norby was constructed by a genius using parts from an alien spacecraft and has unexpected powers

A Space Academy student and his time-travelling robot stop an evil villain from taking over the Solar System in this children’s sci-fi classic. Fourteen-year-old Jeff Wells, a cadet at the Space Academy on Mars, is in danger of being kicked out unless he can improve his grades. With a little help from the academy’s commandant, Jeff finds a robot named Norby to help him study. But Norby’s no ordinary robot. He has the only mini-anti-gravity device in existence. Norby’s special abilities suddenly come in handy when a villain named Ing targets Jeff’s older brother in his quest to conquer the Solar System. When Ing takes over Manhattan Island, renaming it “the Kingdom of Ing,” Norby and Jeff put studying aside to teach Ing a lesson!

This eighth volume of the complete children’s sci-fi series features a history-obsessed admiral and trouble at a dragon’s birthday party. Norby and Yobo’s Great Adventure The illustrious Adm. Boris Yobo wants to travel through time to discover the origins of a treasured family heirloom. And since Norby is the only way to time travel, he and Jeff become Admiral Yobo’s companions on a supposedly innocent weekend trip that turns into a dangerous adventure. Norby and the Oldest Dragon Jeff Wells is feeling decidedly out of sorts, and not even the prospect of the Grand Dragon’s birthday party on the planet Jamyn can cheer him up. In fact, that’s part of the problem. Jeff had wanted to stay at the Space Academy for the weekend. Instead, his sometimes-bossy personal robot, Norby, is making him pack for what he is sure will be an adventure-free trip. Boy, does he turn out to be wrong!

Fifteen-year-old Jeff and his mixed-up robot, Norby, travel backwards and forwards in time and find themselves prisoners on an alien planet in another universe.

Cambridge, UK : Cambridge University Press, 1998.

A new epic fantasy series from the New York Times bestselling author chosen to complete Robert Jordan's The Wheel of Time® Series

When Richard Hanshaw, Jr., acts strangely, his mother suggests a "probe" by a psychiatrist.