1. The Big Bang (approximately 13.7 Billion years ago, according to current data): Prior to the formation of the current universe, another universe existed which was destroyed when the Dweller in Darkness fractured the M'Kraan Crystal, hoping to feast upon the fear that the impending doom would bring to the universe's population. The Phoenix Force, however, reached out to touch every living mind and united them in peace, foiling the Dweller's plan. In spite of this, the destruction of the universe could not be stopped, but Eternity, the sentience of the universe, selected one being - the last living man in that universe, Galan of Taa - to survive and live on, merging with him at the point of universal collapse. Then, initiated by the Living Tribunal, this cosmic egg exploded in the Big Bang (see Oscillatory universe), forming the current universe, and from the cosmic crucible, Galan emerged as Galactus, a key cosmic being in the existence of the current universe. Other cosmic beings (including a reborn Eternity and Death) came into existence at or shortly after the beginning of the universe.^{[citation needed]}

   Several intelligent races evolved, but most died out, replaced by new ones as time passed by. Some, however, left behind a single, immortal survivor; these formed a loose brotherhood known as the Elders of the Universe.^[2]

   One race achieved immortality and great power, but after an attempt to help two other civilizations that ended in their mutual destruction, decided not to interfere anymore, but only to record all events in the universe. They became known as The Watchers. Despite their oath, some have been involved in important events, such as the one appointed as Earth's Watcher, Uatu.^[3]

   When life started to evolve on Earth (approx. 3 billion years ago) the Elder Gods were born from the planet's natural magical energies. However, most started devouring each other and devolved into demons. One who avoided this fate, Gaea the earth goddess, summoned the Demiurge, the planet's sentient biosphere, and mated with it, creating Atum, the sun god. Atum set about destroying the Elder Gods, but in doing so, he too became corrupted, and was transformed into the Demogorge, eater of gods. A small number of the Elder Gods, such as Chthon and Set, escaped by banishing themselves to other dimensions, and influenced mankind indirectly later on. Chthon left behind the Darkhold, a set of indestructible parchments (later bound into a book) whose black magic caused much evil through history. Only Gaea remained on Earth, where she would guide the evolution of life. Gaea, under many different guises, later become the mother goddess of Earth's second generation of gods. Demogorge then released the energies he had absorbed, returning to his form as Atum; these energies later led to the birth of the later generation of demons, such as Mephisto

 Millions of years ago,the mysterious cosmic beings known as Celestials began to experiment with the evolution of many intelligent beings across the universe, influencing races such as the Kree and the Skrulls.

About one million years ago, the Celestials arrived on Earth and experimented on the ancestors of humanity. This experimentation created two new races, the Eternals and Deviants. The Celestials also used the Earth as a womb or egg to birth a new Celestial. They gave some humans the ability to develop super powers (thus providing the potential for the existence of mutants and other superhumans later on) that would manifest themselves around the time that the Celestial was supposed to be born. They did this with the intent of these superhumans protecting the Earth/egg from damage in order to ensure the Celestials' birth. However, millions of years later the humans, with the help of Reed Richards of the Fantastic Four, discovered this plan and successfully ended it. Around this same time Set had created a new race, the Serpent-Men, to be his agents on Earth. They approached the Celestials, but were rejected for experimentation. The Serpent-Men then became jealous of the humans and vowed themselves enemies of the human race.

The Skrulls discovered the Kree and the vegetated race, the Cotati, who shared the same home world, and gave them a test to see which of them were worthy of sharing their technology: whichever race created the better achievement would get it. The Kree created a city in Earth's Moon (in a 'Blue Area' that contained an Earth-like atmosphere and gravity) for this purpose. The Cotati created an ecosystem. The Kree lost the contest, so they killed the Skrull envoys and stole their technology. They abandoned the city, which would later become a base for Uatu. A century later, the Skrulls discovered what the Kree had done, but by that time, they had become a powerful space empire themselves. The two races have hated each other since and have been fighting wars almost constantly.