Si's love of hamburgers leads to a dangerous encounter with an extraterrestrial being.
- ISBN10 044086402X
- ISBN13 9780440864028
- Publish Date 3 June 1999 (first published 26 October 1998)
- Publish Status Out of Print
- Out of Print 5 June 2000
- Publish Country US
- Publisher Penguin Random House Children's UK
- Imprint Yearling (imprint of Random House Children's Books)
- Format Paperback (B-Format (198x129 mm))
- Pages 112
- Language English