CIVILIZATIONS COLLIDE IN THE CROSSOVER EVENT OF THE MILLENNIUM! When Panthro originally set out on his mission to launch a new satellite high above Third Earth, he never imagined that he would wind up changing the destiny of two entire galaxies. But as soon as he boarded the mysteriously deserted space station and began digging into its workings, that destiny was set in motion - and now the day of reckoning is at hand! Alerted to an anomaly at a long-dormant base in a quarantined sector, The Copper Kid, Quicksilver, and Chromium - the SilverHawks' newest member - defy Stargazer's orders and set out on their own to investigate. But as soon as they land on the forbidden planet, they are confronted by a fearsome band of strange, cat-like warriors - and quickly find themselves in a fight for their lives! The battle is joined by more ThunderCats, including several whose fearsome abilities threaten to overwhelm the isolated SilverHawks. But when a second vessel appears in orbit, it becomes clear to Panthro that reinforcements are on their way - and not even the Eye of Thundera will be able to stop them! — Description from Comic Vine community (comicvine.gamespot.com).
