A long time ago, Queen Olympia Butterfly The Queen of Knowledge and 5th Queen of Mewni, decided to learn of Time Travel.
With the help of Omnitraxus Prime, Olympia discovered Time Travel, and went back in time to see where the Mewmans came from. Eventually, she did, and she freaked out. Olympia ordered for Omni to keep it a secret of what they did. However, Olympia was not certain and prayed to the Universe. The next day, Olympia found herself in sore pain, as if something just sprung out of her. Indeed something did, the Clock God; her Son. Olympia liked how the Universe answered her prayers. Unfortunately, the Mhc, including Omnitraxus, took the Clock God away, erased his memory, made him believe that he was Father Time's Brother, and sealed him at the Plains of Time.
Olympia found out, and as an act of revenge on the Mhc, she created an Alternate Timeline from her own; everything would stay the same, however, Star would destroy magic, and cleave Earth and Mewni together. But, not too long after Star does that, the Apocalypse happens. After that, Olympia would devise a plan to have Alt Olympia kill her, and make sure the Enlightened One destroys magic, and bring in the New World.
To combat this plan, Omnitraxus creates a new Alternate Universe, where the Butterfly Family are Males, and are known as the Firefly Family. The 5th King of Mewni, Zeus Firefly, discovers Time Travel, and bands together with a secret society of Orange Hourglass Briefcase carrying people worshipping someone known as the Dame Der Zeit. However, Alt Olympia and 9 year old Olympia from the Celestiaverse arrive and kill everyone in the hideout, including Zeus. 9 year old Olympia is sent back to her time with anesia, Alt Olympia becomes the new Dame Der Zeit and destroys the Fireflyverse, Zeus is reborn in 1926 in the Celestiaverse, and the Apocalypse occurres in the Cleavedverse in 2025.
However, this was all Olympia's plan in the first place; she knew that she would die at the hands of Alt Olympia, she knew what Omnitraxus was going to do, she knew what Zeus was going to do and what he will do, she knows everything, since it has all happened before; Mars The Fortune Teller, Olympia's 3rd Great Granddaughter, will get stabbed by Olympia's 4th Great Granddaughter, Pluto The Unbound. Olympia also knew that her 11th Great Granddaughter, Soupina The Strange, would go crazy and fall off the Dam of Sorrow.
Olympia only knows since this has all happened before, thanks to the Cycle repeating itself over and over again.
However, she didn't know that Zeus would learn of her little ambush attack before it took place. So, he created a clone of himself and sent him to the time of Queen Skywynne Butterfly, and together they create the Orange Hourglass Society or OHS for short, a secret society of Time Travelers to make sure whatever in the Timeline happens, happens. Despite this, Clone Zeus returns moments before Olympia's ambush, kills himself, Olympia attacks, one person survives, takes Baby Zeus with them to 1926 in the Celestiaverse, Olympia destroys Zeus's Universe, and he then uses that as a reason to wage war with her.
Now, in 2040 of the Celestiaverse, Celestia Butterfly heads to Earth to start living a normal teenage life. But, as you know, that won't happen.
And this is where our story begins...