(although the creators prefer it to be called "maxiseries") written by Mike W. Barr and illustrated by Brian Bolland
, published by DC Comics
The story is based on the legend of King Arthur but set in the 31st century. When earth is threatened by an alien invasion (the aliens, of course, being squat, lizard-like creatures killing everyone on sight), Arthur reappears and with the help of Merlin gathers his old comrades Lancelot, Cai, Galahad, Perceval, Gawain, Tristan, and Guinevere. They are all ordinary people who suddenly "awaken" and discovers that they are indeed knights of the round table. This makes for some problems as Tristan awakes in the body of a woman...
The comic was revolutionary in several ways. It was one of the first mainstream superhero (if you can call it that) stories for adults. Several main characters die or disappear during the story, and the lesbian love scenes with Tristan and Isolde sparked some controversy. It's pretty safe to say that "Camelot 3000" paved the way for other great works like "Batman: the Dark Knight Returns" and "Watchmen".