Warning! Spoilers for Eternals: The Heretic #1 ahead!
The Eternals are all-powerful creatures, gifted with immortality and superhuman faculties. One of them, however, ascended way above the level of the rest of his species and became similar to a god. Finally, Marvel has unveiled the details of Kronos' past and his origins.
A race of superhuman immortal beings created by the space gods known as Celestials, the Eternals' purpose is to watch over humanity and ensure its continued survival and evolution. The Celestials created only one hundred Eternals on Earth, but due to internal conflict, some of them migrated to other planets. The most important Eternal colony off-Earth is on Titan, where the Eternal A'lars took refuge after a schism that put him in contrast with his brother Zuras. However, when the Titans were first introduced in Marvel Comics in 1972, in Iron Man vol. 1 #55 by Jim Starlin and Mike Friedrich, they were not related to the Eternals. They were a highly advanced alien civilization that had spawned one dangerous individual, Thanos, the son of A'lars. To stop him, the leader of the Titans petitioned his god, a mysterious figure known as Kronos, who created Drax the Destroyer with the purpose of ending Thanos' threat.
Related: Thanos Accidentally Proved One of Marvel's Most Hated Villains is a Hero
Over the years it would be established that Kronos is actually an Eternal, and now Eternals: The Heretic #1 by Kieron Gillen, Ryan Bodenheim, Edgar Salazar, and Chris O'Halloran reveals that he is one of the most important and powerful Eternals in history. Kronos was revealed to be an Eternal in«The First Eternals,» a story by Ralph Macchio, Rich Buckler, and Chic Stone, appearing in What If...? vol. 1 #24 in 1980.
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