Billion Year War

The Billion Year War was an event that left Earth (and possibly other planets, and it is hinted several alternate Earths) devastated. While it is unclear what the war actually was about or how long it actually makes lasted (Acachalla declared it 'a Billion Year War' on the day it started and the characters only seem to have aged ten years, and VenturianTale is well known for exaggerating), it allowed alien tripods to invade the Earth. The soldiers who took part in the war include Papa Acachalla, Josh, Action Charlie, Johnny Ghost, Jenny Ghost, Jenny Toast, Roderick, Tony Stark, Colon Ghostie, Jerald the Pikachu, Godzilla, Donald Trump, Barry Bee Benson and Sally Acachalla. The war was prevented by Johnny Toast travelling back in time and assassinating Papa Acachalla before he could start the war.

Eve of the War
Whilst on holiday with his daughter Sally, Papa Acachalla was witness to a tripod appearing out of nowhere and killing a janitor sent to investigate a paranormal bathroom at the hotel he was staying at (the bartender/hotel manager of which looked suspiciously like the future war hero Action Charlie, though it cannot be confirmed that they are the same person). Acachalla grabbed at a sniper rifle the man had found in the bathroom and shot the tripod until it stopped moving and went outside with his drink, leaving Sally to deal with the toilet problem. However, as soon as he left, more tripods started appearing, overrunning the beach and sending Acachalla into a panicked frenzy as he opened fire on them and demanded they send for the military before being overwhelmed.

The Prophecy
Corporal Action Charlie was heralded as the last hope for humanity in the final days of the war, saying that he had been named at birth as Corporal Action Charlie The Last Hope For Humanity During The Billion Year War Who Will Save Us All From Ourselves and claiming that his coming was foretold on a sheet of toilet paper recovered from Acachalla's vacation site (it is unknown who wrote it; the owner, on discovering it, asked the cleaner to have it translated but he was killed before he could complete the task). (He would later reveal to one of Acachalla's clones that the text actually named Acachalla as the last hope shortly before his death). Acachalla did not believe in the prophecy and believed that he himself was the last hope for humanity.

Action Charlie was kidnapped by a rogue human faction known as the Pirates whilst he was out looking for supplies with Acachalla. Acachalla escaped the ambush using respawn and tried make his way out of the ruined city, dodging tripods and scanners. Meeting two survivors (one possible infiltrator from a battalion, and Josh), and then losing them again when they fell off a roof and knocked themselves out, Acachalla witnessed Action Charlie being shot by a crab creature. This may have been an Infiltrator however as another Charlie showed up moments later and holed up with Acachalla in a small cottage, and Acachalla proved once and for all that he is a better shot on the toilet by killing an invading Pirate member. However, Charlie was shot and fatally wounded by an enemy sniper, though not before divulging the truth about the prophecy to Acachalla.

Mankind Divided
Acachalla would shortly after avenged his fallen comrade with the aid of a time-travelling Sally arriving from the past - Sally distracted the sniper long enough for Acachalla to kill the sniper with Charlie's own rocket launcher - the same one that would seemingly kill him minutes later in a tripod battle when it misfired and hit the roof of their base.

Johnny Ghost, secretly working with Sally's Armada against Acachalla and PIE because he believed Acachalla was evil and Sally was good, somehow became aware of Acachalla's death and used it as leverege to create tension between the factions, and ultimately caused an all-out war between the two by killing four members of Sally's armada.

He would later reveal to his companions the reason for his betrayal of PIE and convinced them to join him in the fight. After relaying the story of how the war began to Dohfe, they were sent to activate a nuclear bomb that was hoped to be strong enough to wipe out the tripods. Unfortunately the bomb had no remote activation and had to be detonated remotely, requiring someone to stay behind and sacrifice their life, and as the only remaining analogue bomb technician left the responsibility fell to Dohfe.

Ghost and the girl fought off the tripods whilst he prepared the bomb until he was ready and tried to get out of the blast area before it went off. However, they were unable to make it time and were caught in the blast.

Fallback
Though the blast did successfully defeat the tripods, without the leadership of Ghost or Toast (the latter being long since absent working on a top secret project and only communicating via messenger), PIE was ill-equipped to deal with the might of Sally's vastly superior and more technologically advanced forces (having somehow secured the use of headcrabs, zombies, tripods, and even Godzilla). As their leaders refused to consider anything less than victory, they would not negotiate or surrender to them, essentially ensuring their own destruction.

Chris 'Colon' Ghostie, worked within the Armada as an informant by disguising himself as 'Censored Face', the victim of a nuclear explosion that left him horribly deformed and forced to 'censor' his face with a missing texture mask.He was discovered by Armada scientist Higgilydiggilyhögan snooping around Ghost's crashed car. Högan reported this to Sally; Ghostie tried to convince them that Roderick was a traitor but only managed to convince Roderick, before Högan revealed that he had seen his name on the inside of his beanie when it went into the wash. His cover blown, Ghostie dropped his disguise and fled, stealing Roderick's 'helicopter' (in actuality a car built to replace the actual helicopter he had misplaced). Sally's forces gave chase in the hope that Ghostie would lead them to one of the few remaining PIE bases.

The assumption paid off and they were led directly to Jenny Ghost and Jenny Toast, who only learned of the Armada's imminent arrival minutes beforehand. Roderick and Jerald the Pikachu greeted them with a mixture of fear and hostility and tried to arrange a truce with the PIE team. Ghost instead instructed Jenny to set Donald Trump on them, only to discover Trump on the other team running over and eating Pikachu before teaming up with Barry Bee Benson to kill the team. They failed and were themselves killed. Roderick tried one more time to try and arrange ceasefires just as Josh showed up and complimented Jenny Ghost's new jacket. He once again failed and they chased him back, only to be turned back when the armada started attacking them. After killing Roderick when he tried to sneak around behind them and shoot Josh, they ran out of ammunition and received what they believed to be a coded message from Toast before retreating to a warehouse to get ammunition, It was clear by this point, however, that the war was drawing to a close and they had little to no chance of winning.

The Last Stand
At the site, Josh raced to work on getting a downed tripod working in time to face the armada and to fight their latest weapon - Godzilla. However, work was halted when a sniper opened fire on them, killing at least three employees (a fourth was shot by Josh for blocking their exit). Josh managed to take out the sniper from the garage window by shooting them with a Desert Eagle, a feat considered ludicrois by Jenny Ghost but enough to earn her respect. Whilst scouting out the armada in a car, they came across a man with a sniper rifle driving a death car who had taken control of the town. They tried to convince him to join them, but he refused and demanded they leave. Josh picked them up in a stolen helicopter, though not before Jenny Ghost let the man know her thoughts on him ('I hope Godzilla stands on you and squishes you!').

Droping off Jenny Toast and Josh back at base, Jenny Ghost took control of the helicopter and engaged Godzilla in battle. Her attacks were ineffective and Ghost's helicopter was destroyed. Acachalla joined up with the only other two remaining PIE members in the area - Jenny Toast and Josh - and tried to stop the fighting by shouting at Godzilla. After Jenny was crushed by Godzilla, Acachalla fired a nuke at him and ran for his life.

Endgame / Erase & Rewind (the Skynet Solution / Prevention of the War)
Acachalla was the only survivor of the blast. He survived by hiding in a fridge before being captured by Sally's forces. As the only remaining PIE member (or so was thought), he was brought to the Waffle Kingdom, to the Royal Court of Queen Sally where she sat on her throne atop a plateau suspended over fake lava. Acachalla refused to bow, prompting the guards to shoot at Acachalla, but Sally bade them to cease and offered Acachalla to spare his life if he would work with her to rebuild the world. Acachalla refused to work with them, refused to even acknowledge that he had lost the war, and attempted to escape before being gunned down by an overzealous guard who was himself summarily executed for his incompetence. Though the fake lava brought some contention (it made Sally look less dangerous and cool), the death of Acachalla brought to an end the conflict and left Sally Acachalla the sole ruler of the Earth.

Unbeknownst to Papa, Johnny Toast went back in time to stop him from causing the war.Each time failed because Papa kept shooting the first Tripod from the resort. This kept happening over and over and each time got increasingly stranger and different from the original event until eventually Johnny just killed everyone including Papa to stop them from killing the Tripod and triggering the war. This left the Johnny Ghost from the new timeline with a massive bill from the Committee of Time Micromanagement as his many attempts to go back had left the space-time contimuum very convoluted and allowed several memes to get through. Toast declared that as he wasn't from their time he didn't have to pay it and skipped away, leaving Ghost standing outside the hotel on the beach, rather irritated and confused.

Papa Acachalla's army
The survivors fighting under Papa Acachalla's command. Collapsed after his death and merged into the PIE Army.

Sally's Armada
Survivors fighting under Sally's command. Includes zombies and headcrabs. All human members wear pantsuits. The armada also have helicopters and APCs at their disposal. this makes them the most well-armed faction of the Earth resistance seen so far. In fact, the armada was powerful enough to become the sole faction to control the Earth, resulting in the creation of the Waffle Kingdom.

PIE Army
An army of ghost hunters led by Johnny Ghost until his supposed death. It is presumably led by Johnny Toast, who has gone into hiding. They were wiped out by a Papa Acachalla's nuke.

Unknown Alien Species
An unkown species dropped several tripods and other soldiers onto the planet. The enemy of the Earth Resistance. A Higgilydiggilyhögan clone said that the aliens are the tripods themselves, though this is later disproven by Josh taking control of one. The aliens are also seen using other aliens, as well as floating scanners that seek out the Enemies and scout locations and are capable of opening doors without touching them.

Pirates/Raiders
Survivors, likely mentally damaged because of the War, that attack and kill others for their ammo, food, and water.

Infiltrators
A seemingly neutral faction of beings who look like whatever species they are infiltrating the faction of, but with two irises and pupils in each eye. It is unknown why they infiltrate other factions but they don't seem to want to attack the Earth Resistance, one of them even tried to help Acachalla find Action Charlie but ended up dying from falling.

The Birds
The Birds are an alien species that can change between human and bird form. They are allied with the Earth Resistance.

Appearances

 * ACACHALLA IN THE BILLION YEAR WAR! | Fan Scripted Challenge - Episode 1 (First appearance)
 * FALLEN HEROES IN THE BILLION YEAR WAR! | Fan Scripted Challenge - Episode 2
 * https://www.youtube.com/watch?v=Fkr08Z3kS1o&t=661s

Trivia

 * Due to some of the raiders wearing the uniforms of Combine soldiers, it is possibly that they raided a police station for their armor. Or the Combine took part in the War.
 * It is unkown whether the Infiltrators are aliens, androids, or something else, but they are most likely able to shapeshift.
 * It was revealed in the second episode that Papa Acachalla was the one who started the war by killing one of the tripods.