From the publisher:
The Legion of Super-Heroes finds itself stranded in a distant galaxy, on the home planet of the vicious alien race known as the Progeny, in this new hardcover collecting the cult favorite 12-issue epic. While some of our heroes struggle to repair their damaged spaceship, the rest attempt to forge an alliance with the peaceful Kwai. But can the Legion help the Kwai defeat their oppressors and still make their way back home to Earth?
Collects Legion Lost #1-12 (2000).