Legion of Super-Heroes The Great Darkness Saga (Legion of Super-Heroes Vol. 2 #287, #290-294)

This is the Earth in the 30th century. A world of science and technology. A world of peace and light. Preserving this peace is the Legion of Super-Heroes, a group of young adventurers who are the best and brightest of their kind. But a darkness is approaching their world. A centuries-old evil threatens to destroy their entire universe. Herein lies the story of the Legion's greatest challenge, complete in one volume.

Collects Legion of Super-Heroes (1980) #287, #290-294.