Book excerpt: Collects Nova (1976) #20-25; Fantastic Four (1961) #204-206, 208-214. Nova's sensational '70s series comes to a close, but that's not the end of his story! Nova faces the Corruptor, Diamondhead and Dr. Sun before blasting into space to tackle the Sphinx! But when the shape-shifting Skrulls attack, old enemies must forge alliances to survive...and when Xandar's Queen Adora begs the Fantastic Four for help, the stage is set for a cosmic battle across time and space! The Sphinx is ready to conquer the world, and Mr. Fantastic knows of only one opponent who can stop him: Galactus! But with the FF rapidly aging thanks to a Skrull weapon, do the heroes have enough time left to find him? And do Nova and the Champions of Xandar have what it takes to save their adopted planet from the Skrull armada?