Base of Operations
The planet Xandar, also Nova Prime starship
Fantastic Four #208 (1979)
Thinking Xandar totally destroyed, Nova Corps leader Rhomann Dey pursued Luphom leader Warlord Zorr to Earth, where the dying Dey transferred his Nova powers and uniform to human teen Richard Rider, who helped destroy Zorr. Rider used his new powers to become the super-hero Nova, battling foes such as the amnesiac Syfon warrior Powerhouse, the gem-bodied Diamondhead, the immortal Sphinx, and the cyborg Doctor Sun; he befriended fellow heroes such as the high-tech vigilante Crimebuster and his long-lost father, the electrical-powered 1950s super-hero known as the Comet. The Sphinx ultimately manipulated these six other heroes and villains into helping him fly the late Dey's Nova Prime starship back to Xandar, which was now at war with the invading Skrulls. The Sphinx vastly enhanced his powers and knowledge by tapping into Xandar's Living Computers (housing the collective memories of millennia of Xandarians) and became an even greater menace, but was soon defeated by the Fantastic Four with the aid of Galactus; however, the Sphinx's ex-shipmates (minus Doctor Sun) banded together to defend Xandar as the planet's new Champions. Soon joined by Nova Corps leader Tanak Valt and the Protector (caretaker and avatar of the Living Computers), the Champions became Xandar's foremost warriors.
The Skrull-Xandar war was a long, bloody conflict that eventually exposed a traitor within the Champions: Diamondhead, still an unrepentant villain at heart, betrayed the Xandarians to the Skrulls, resulting in the death of Crimebuster and the penetration of Xandar's defenses by a Skrull army. Despite this, Xandar's forces prevailed with the aid of the Spaceknight ROM and dealt the Skrulls a decisive defeat. With peace restored, a homesick Richard Rider returned to Earth, forfeiting his Nova powers since they were reserved for the defense of Xandar. In his absence, Xandar was invaded yet again, this time by the forces of the space pirate Nebula (daughter of Zorr), who reportedly wiped out the entire population, including the remaining Champions. As she died, Xandar's queen Adora restored Rider's Nova powers from afar.Years later, contingency plans set in motion by Protector and Adora before their deaths reactivated Xandar's computerized Worldmind (now programmed with a facsimile of the Protector's consciousness), which began resurrecting Adora and other Xandarians in cloned bodies; Xandar rose from the ashes yet again. The Nova Corps has been rebuilt as the Xandarian Star Corps and Rider sometimes works with them in addition to his Earthly superheroics, but it remains to be seen whether any of the lost Champions will be found or resurrected. Diamondhead returned to crime on Earth but was shattered in battle with Nova. For now, Richard Rider is the sole known survivor of the Champions of Xandar.