Beginning of time-

A bored King Poseiden travels back in time and creates a pocket universe filled with sea creatures that would evolve to become similar to mankind so he could one day rule over them, returning to his time afterwards.

65,000 years ago-

An elderly starfish discovers an immortality elixir, and drinks it, becoming the immortal starfish that would one day be known as Grandpat Star.

40,000 years ago-

Grandpat and another starfish are eaten by a Squidasaurus Rex, with only Grandpat escaping with his life.

23,000 BC-

The Atlantean aliens arrive on earth, forming a colony city in Poseidon's pocket dimension.

12,000 BC-

The Atlanteans accidentally create a monster that begins attacking them. It is opposed by seven enemies from the future, who place their souls into 7 flower-cloud shaped gems created by the atlanteans to seal the monster away. These relics become known as the 7 sea crystals.

980 BC-

Poseidon launches a rebellion against Zeus in an attempt to take the throne of Olympus for himself. However, he fails, and as punishment is stripped of his godhood and turned into a mortal infant, being sent to live with the atlanteans.

625 BC-

The underwater Roman empire is established.

150 AD-

Grandpat, a collosium clown, outsmarts and defeats the gladiator Moronicus in combat, humiliating him.

480 AD-

The underwater Roman Empire collapses.

995 AD-

A ship crashes off the coast of the kingdom of Bikini Bottomshire, King Krabs discovering a baby whale and sponge in its ruins. The king adopts the infants and names them Isabella and Robert. However, they would more commonly be known by their nicknames Pearlina and Bobby. Grandpat also becomes a barber this year.

1015 AD-

A ball is held for Bobby to choose a wife, as King Krabs was growing old. During the preparation for the ball, Bobby meets a peasant who wishes to make things better for the others of her class, as well as the dimwitted son of a blacksmith. All of them quickly become friends. However, Krab's grand vizier and his wife attempt to sabotage the friend's efforts to change the kingdom in order to seize power for themselves. However, this is foiled, and Bobby becomes the new king.

1020 AD-

The Atlantean sea monster is revived by a dark sorcerer, and goes on a rampage. To stop this, Spongicus Kane, estranged brother of King Robert, is sent by a mysterious figure to gather 7 allies and the 7 sea crystals. He finds them, and with their help manages to destroy the sea monster.

1025 AD-

Bikini Bottomshire is attacked by a giant dragon, and the allies Spongicus had made against the atlantean sea monster disappear when they clash with it, never to be seen again. In actuality they had been sent back in time, where they eventually became the sea crystals.

1026 AD-

Spongicus comes across a beautiful seahorse while hunting, and his hunting worms refuse to allow him to kill her. Curious, he takes the seahorse to his house, where it suddenly transforms into a female sponge. She explains that she had been turned into a seahorse by a demon named Kibara when she refused to date him, and that Spongicus's home had somehow changed her back. She and Kane end up getting together.

1027 AD-

During one of Spongicus's hunting trips, his now pregnant wife is lured out of the home by Kibara, who turns her into a seahorse again. When Spongicus returns home, he finds the house empty, and searches for his wife to no avail. He would never see her again.

1034 AD-

Spongicus stumbles upon a young sponge boy in the wild, and upon seeing his green eyes, realizes him to be his son. And so, he takes the young child in.

1159-

Grandpat leads an army in an attempt to conquer the nation of Klopnod. However, while his army is able to nearly take the city, they are ultimately defeated, and the victorious Klopnodians rub it in Grandpat's face by naming a cream puff after him.

1204-

The Atlanteans lock themselves away from the outside world.

1300-

Poseidon, now fully grown, convinces an Atlantean blacksmith to create a trident for him. However, he then uses the trident to kill the blacksmith, and then wipes out the entire Atlantean population, converting the city into his own personal Casino City afterwards. He even names it "The lost city of Atlantic City" to mock the Atlanteans.

1320-

After several wars, Poseidon manages to sign a law to that allows the sea nations to keep their autonomy, but they are officially under his rule. He had it like this so that he could focus on maintaining his youth using sea snail slime, and executing those that slighted him in flamboyant extravaganzas, even inviting celebrities to play songs or perform.

1849-

Grandpat, now a door to door vacuum salesman, stumbles upon a paranoid old goldigger who had locked himself in a cave with all his gold. While showing off the power of the vacuum cleaner, Grandpat accidentally sucks up all the gold as well as the goldigger himself.

1874-

The woman's lactose intolerance movement (WLIM) is founded, dedicated to ending the alcoholic ice cream industry that the city of Bikini Bottom was known for.

1917-

The Ice cream prohibition act is passed, banning all ice cream. To counteract this, Squeak-easies are opened, where people could enjoy ice cream in secret.

1922-

Grandpat is arrested after being discovered in a Squeak-easy, and during his time in prison he learns to like prunes.

1925-

Grandpat is released from prison on parole.

1926-

Con artists the Filmflam brothers borrow 10 dollars from Grandpat and then leave town. Grandpat would remember this for years to come.

1933-

The Ice cream Prohibition is ended, and the WLIM is disbanded.

1958-

Grandpat, disguised as a young man, meets a female blue starfish named Iva. Iva had a genetic disease that severely stunted her brain development. Despite this, the two end up becoming a thing and get together.

November 20th, 1960-

Eugene Krabs is born.

July 19, 1961-

Cecil Star, the son of Grandpat, is born. Unfortunately, Iva died in the birthing process, causing Grandpat to fall into a brief depression and ditch the young disguise.

September 12th, 1961-

Sheldon Plankton is born.

1962-

Bunny, a Klopnodian, is born.

1965-

The superheroes Mermaid Man and Barnacle Boy emerge, and with them also emerge supervillians that threaten Bikini Bottom over the course of the next two decades.

1975-

An evil race of cat aliens from the planet Purria set up a corporation in the ocean dubbed Nekat corp, a weapons production company meant to sell weapons and ultimately get fishkind to wipe themselves out so they could take over.

1979-

Cecil and Bunny are married, both being compatible due to their shared lack of intelligence, which Cecil inherited from his mother. The same year, Larry the Lobster is born.

1982-

A communications breakdown between the Klopnodians and the Bikini Bottomites leads to a war breaking out, Mr Krabs serving in the Bikini Bottom Navy, and Grandpat serving in the marines. The two end up becoming rivals, but maintain a relatively amicable relationship. Several groups of pirates also join in the war, taking advantage of the chaos.

August 19, 1983-

Bubble Bass is born.

June 14, 1984-

Samantha Star, Cecil and Bunny's first child, is born.

October 9th, 1984-

Squidward Tentacles is born.

March 1985-

Mermaid Man and Barnacle Boy retire, as do their villains.

August 17, 1985-

Patrick Star is born.

October 7th, 1985-

Sandy Cheeks is born in Texas, United states.

July 14th, 1986-

Spongebob Squarepants is born.

1988-

The Klopnodian wars end in a ceasefire, much to the anger of the alien cats.

1989-

The Star family moves to randomland, a place where the laws of physics don't apply, which was perfect for them.

1990-

Sam Star is lost in a surf, but survives as her family attempts to move on without her.

April 1991-

Sandy is visited by her older self from timeline B, who instructs her to go to Kamp Koral, hence creating this timeline.

Summer 1991-

The alien cats attack the planet Snailria, and to save his young son Gary, the King sends him to earth as the planet is destroyed. The same year, Spongebob attends Kamp Koral for the first time and meets Squidward, Sandy, Patrick, Gary and Mr Krabs. Squidward, Patrick and Sandy were fellow campers, Gary had stumbled across him while roaming his new home, and Krabs was the camp cook.

May 12th, 1992-

Given inspiration to open a restaurant by Spongebob praising his cooking, Mr Krabs begins drawing up plans. While walking around with his notebook and wondering about a good name, he stumbles upon a whale that had been killed by humans and its infant daughter. Noticing that she had the evolutionary gene, Krabs adopts her and names her Pearl.

Summer 1992-

Everyone goes to Kamp Koral, with Krabs being the headmaster this year. Plankton also attends and this is when timeline B Sandy's plan is fulfilled, and Plankton is prevented from discovering the formula too early. The group also meets the hillbilly narwhals Narleen and Nobby this year.

1993-

Mr Krabs is recruited into a secret government spy group designed to track down and stop any threats to Bikini Bottom or the ocean in general. His teammates are two sea sponges, a male and female.

1994-

The star family adopts a young female squid named Squidina.

1995-

The 3 spies begin working undercover at Nekat corp and discover clones being created to use in the military. They all destroy the clones, and in response Nekat bombs their houses, killing the two sponges. Luckily Krabs was taking a walk with Pearl when his house was attacked, so he survived. Afterwards, the Sponge's son, who was Spongebob, is placed into an orphanage, while Krabs retires from service for good.

1996-

Mr Krabs discovers the Krabby patty secret formula and opens the Krusty Krab restaurant. The same year, Plankton opens the Chum Bucket restaurant after graduating college.

1998-

Mr Krabs and Plankton begin playing cards together.

1999-

Patrick and his family star in a TV show known as the Patrick Star Show, with Patrick's friends from Kamp Koral making occasional appearances.

2004-

The Patrick Star Show ends as Patrick moves out, moving to Bikini Bottom.

2010-

Spongebob moves to Bikini Bottom and adopts Gary as his pet.

2011-

Squidward joins the Krusty Krab, becoming the first ever employee of Krabs.

2012-

Spongebob joins the Krusty Krew.

2013-

Plankton wins a card game with Mr Krabs, getting Spongebob in the process. However, it ultimately ends up backfiring, and Mr Krabs gets Spongebob back.

2014-

Plankton creates a Krabs robot to steal the formula, and while he is able to gain Spongebob's trust, the sponge accidentally triggers Imitation Krab's self-destruct, foiling Plankton's plan.

2015-

Plankton fakes injuries to sue Krabs and get the formula. However, he is proven to have faked his injuries thanks to Spongebob, and his plan fails.

2016-

The first ever Krusty Krab talent show is held by Squidward. This eventually becomes simply the comedy night by 2020.

2017-

Plankton cheats on his computer wife Karen with Mr Krabs's mom. However, the relationship doesn't last long, and Plankton and Karen reconcile.

2018-

Plankton dresses up as his grandmother to attempt to fool Spongebob into giving him the formula. However, once his Grandmother wakes up, she promptly takes her clothes back, another one of Plankton's schemes going down the drain.

2020-

Poseidon's supply of sea snails runs out, and he offers a boon to whoever can get him a new snail. Plankton takes this opportunity to kidnap Gary so that Spongebob would go save him and hopefully get killed. Spongebob and Patrick head to Atlantic City to save Gary, being aided by the sentient tumbleweed Sage. however, the incompetent idiots that they were, Spongebob and Patrick are captured, and are only saved from execution by their friends, including a remorseful Plankton. Ultimately, Spongebob ends up befriending Poseidon, who changes his ways and lets the snails free, the Bikini Bottomites all adopting them.

3000-

A time traveling Grandpat battles an elderly descendent of Moronicus in the clamocium, and the new Moronicus loses thanks to a oldie-o ring. Grandpat remains an uncontested champion.