Previously on Marvel:

The greatest heroes of the Marvel Universe have joined forces! The Mighty Avengers! The Amazing Spider-Man! The Uncanny X-Men! The Fantastic Four! Together, they fought against the Terrifying Trio, The Mutant Menace: Magneto, The Tyrannical Future Ruler of Earth: Dr. Doom, and The God of Mischief: Loki, on their orbital space station, Asteroid M, and destroyed their powerful superweapon powered by the Cosmic Stones! However, this "Weapon" was actually a mind-control device, made for using the Devourer of Worlds, Galactus, to serve his master. Loki had deceived his former comrades into making them think that they would rule the world. With his device, activated by a powerful artifact called the Tesseract, Loki would use Galactus to exact his revenge against the Avengers along with their allies. He would make Galactus literally consume Earth, and then do the same to Asgard, the realm of the gods. However, with both hero and villain alike fighting him, Loki was defeated yet again. However, while our heroes were celebrating, they were unaware of another evil lurking throughout time….