Warren Ellis extends the reach of his Excalibur run by having The Uncreated race of aliens attack the Shi’Ar, who then call on the Starjammers for help. (He even has a cameo by Cerise, who left the Excalibur team to work for Lilandra of the Shi’Ar.)
There are little touches that let you know Ellis is writing it (like Corsair losing a drinking contest to an alien who is able to shunt his alcohol into multiple bladders), and a new (and somewhat sinister) portrayal of the Shi’Ar as an empire that colonizes other cultures in an effort to “marry” them and make them better.
But on the whole this is just a mediocre adventure with solid Pacheco art.