The Multiversal Timeline

Note that with so many cosmic events in many separate sources, i'm going to use the Lovecraft series of events as something to have something on the page and will include many other pop culture sci fi events later down the road.

This is a full timeline comprised of all major events in interstellar pop-culture. From the Great Time War (Doctor Who) to the destruction of the Death Star (Star Wars). From man's first contact with extraterrestrials (Close Encounters of the Third Kind, Arrival, Contact) to the destruction of major planets (Titan A.E., Transformers, DC, The Hitchhiker's Guide to the Galaxy, Star Wars, etc.)

The Creation of the Universe

 * 13.7 billion years ago, a big bang occurs (general scientific belief of the universe's creation), this big bang was caused by Azathoth. A giant amalgamation of limbs, eyes, and mouths floating through space who is a cosmic deity whose very existence caused the creation of the universe (Lovecraft). Azathoth later brings three sons into existence: Nyarlathotep, the Nameless Mist, and the Darkness. As Azathoth continued creating and destroying many worlds in the universe, his sons created minions and devised a plan to put Azathoth in a sleep like state and put a halt to his chaos. They succeed and overtime, give existence to Outer gods such as Cthulhu which have the same cosmic god-like status as Azathoth and his sons. These Outer Gods then bring life to variou Great Old Ones who bring life to various alien lifeforms on other preexisting planets.

4.5 Billion years ago (the Beginning of the Earth)

 * A race of aliens that resemble mice created a massive supercomputer to calculate and answer the questions about the meaning of life, the universe and everything. This supercomputer was named "Deep Thought" which camed up with the disappointing answer "42" as the meaning of life, the universe and everything. But based on what Deep Thought had told them, the mice-like aliens had to create a much more massive supercomputer with enough processing power to come up with a more understandable answer to their existential questions. This new supercomputer was the Earth (The Hitchhiker's Guide to the Galaxy).
 * As the Earth begin to cool down from its own creation, a Great Old One named Cthugha arrives on Earth with his legion of Fire Vampires (Lovecraft).

1 Billion Years Ago

 * A race of aliens known as the Elder Things arrive on Earth in the Antarctic region and created a city within the ice.