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.
- ISBN10 0802767109
- ISBN13 9780802767103
- Publish Date 1 March 1988 (first published 1 September 1987)
- Publish Status Out of Print
- Out of Print 14 June 2021
- Publish Country US
- Imprint Walker & Co
- Format Hardcover
- Pages 102
- Language English