The Super Smash Bros. Ultimate infection horror alternate universe (AU) is a dark, fan-created reimagining where a mysterious, parasitic pathogen breaks out across the massive crossover world, corrupting the roster of iconic fighters. The story centers on a desperate struggle for survival as the infection spreads rapidly through physical contact, spores, or supernatural corruption, turning beloved heroes and villains into grotesque, aggressive husks of their former selves. A small, uncorrupted pocket of survivors must band together, put aside their past rivalries, and navigate the atmospheric, ruined landscapes of familiar game stages that have been twisted into claustrophobic nightmare zones. As they fight to avoid their infected former allies, the remaining characters search for the origin of the outbreak, desperately seeking a cure or a safe haven while grappling with the psychological horror of facing their closest friends in lethal combat. The world so far has only two survival groups. Ness's group: Ness: the leader of the group and the one making notes. His hat is now fused with Cappy. Marth: Sadly he was infected but it was ceased after villager amputated his arm. He now only has one arm to fight with his sword the, falchion. Sheik/Zelda: Worries about link. She constantly tries to leave camp and too find him but ness wants everyone too stick together which sheik has eventually obeyed. Villager: From animal crossings. He's from a world thats meant to be bizzarely happy and detached. He's still smiling but he is a little nervous. Cappy: From super mario odyssey. Mario's magical hat from the cap kingdom. Friendly, energetic, and slightly timid. Ness's group is so far on the run and doesn't really have a singular base but hes not going to give up. In a secluded forest however is Dr mario's labratory and base. Dr Mario's group: Dr Mario: From the game dr. Mario. Unfortunately, seeing the original mario died has twisted his morality making him more cold and his research on stage 3 infected fighters are primarily for his curiosity and sometimes... Maybe a cure. He treats R.O.B as a tool rather than a partner and R.O.B is getting more and more injured from handling the infected. R.O.B: R.O.B. was introduced as the Ancient Minister, who was forced to lead the Subspace Army and create subspace bombs. However, this was against his will. Dr. Mario later found him during the infection and R.O.B acts as his errand boy and infection captor and eliminator. The infected have damaged R.O.B severly but dr. Mario refuses to repair him. Mewtwo: From Pokemon. Mewtwo came too the base seeking shelter and safety. Dr. Mario being skeptical locked him in the lobby. He is not infected. Mii swordfighter: From Super smash bros ultimate. Another fighter seeking shelter in the base. He was also placed in the lobby for skeptism. He is also not infected. Sadly kirby is the first one too be infected and killed mario: Kirby: From the kirby game series. the first one to infected. in stage 1 he seemed normal and upbeat. Stage 2 he couldn't stop smiling and was scared and sad. in stage 3 his aggresion appeared and he has lost all free will as part of the infected. he killed mario unfortunately. in: Infected The Infection 4 Save Edit Contents 1 Overview 2 Phases 2.1 Phase 1: 2.2 Phase 2: 2.3 Phase 3: 2.4 Phase 4: 3 Example of Infected Overview The Infection is the main antagonist of the World in Dark AU, the Infection does not have a name yet, as Luft-P hasn’t confirmed it yet, the Infection has 4 known Phases. Phases Phase 1: They’re not erratic, compulsive, or aggressive yet, They seem completely normal, the only difference is a small black sting, typically on an arm, according to Ness and Cappy’s analyzation, the sting is presumably made by an Infected victims tentacle, it won't cause pain in the affected area unless the tentacle went too deep into the flesh. It is usually where the tentacles start to appear. This stage can be skipped if the wounds are too deep. Phase 2: It starts a day after the first Phase, the victim appears to have dull eyes but is completely conscious, however, Pain is felt from the sting wound of the victim, the victim also starts to smile involuntarily, and looks worried and scared, The infection begins to spread from the wound, the veins around it begin to look black even though the blood of the infected person remains the same reddish tone, according to Dr. Mario's notes. apparently the sanity and fear of the infected play a crucial role in the speed of infection. Phase 3: This is where it gets noticeable, the eyes go fully Void and the victim is blind, and has a presumably empty body, the victim also acts violent, but does not try to hunt, the victim is also very hungry, and according to Ness and Cappy’s analyzation once again, they still have reminisce of their old personality, the victim also has a highly distorted voice and also has a formation of tentacles that are used to spread the Infection, At this stage they are condemned, according to Dr. Mario’s notes, he performed an autopsy on Olimar's body while he was in this phase, to Ness and Dr. Mario’s surprise, in this phase the infected are surprisingly intelligent and agile despite their deteriorated state. Phase 4: From what Ness saw with Olimar, they appear to be able to survive extreme damage such as the autopsy and are able to work together like Pichu and Mewtwo. They mutate into a twisted version of themselves and from what we’ve seen, everyone has a totally different mutation, their only common attribute is their violence. Machines are "maybe" immune to the infection. Palutena is unfortunately on stage 4 of the infection but she has a good way of concealing it and has more free will then the other mindless beast infected. In a Super Smash Bros. Ultimate infection horror Alternate Universe (AU), often referred to as "World in Dark," the infection transforms iconic fighters into grotesque, Lovecraftian entities. The infection, heavily featuring themes of decay, tentacled horrors, and ravenous hunger, starts with a festering, sting-like wound that causes unnatural, forced smiles and dull, void-like eyes in its victims. Inkling’s role in this scenario is particularly nightmarish, as she is a sentient, aquatic creature; her infection would likely twist her squid form into a "kraken-like" monstrosity, with black, viscous ink spreading like a rot and her tentacles becoming jagged, uncontrollable limbs, rendering her a terrifying, mutated kraken in fan interpretations. The infection progresses through distinct, terrifying phases where fighters lose their sanity and "you-part," becoming mindless, aggressive vessels driven by hunger, according to AU lore. Characters like Kirby may start the infection, with the corruption spreading to consume Dreamland, while others like Marth might show symptoms requiring extreme measures, such as amputation, to stop the spread. The infected develop unnatural abilities, forming tentacles from their bodies to attack others, often spreading the virus through bites or stings. The environment itself changes, with the world turning dark, and the previously cartoonish, immortal fighters now dying and bleeding, losing the safety of revival. Other characters would have equally horrifying transformations: a corrupted Mario might look like a decaying marionette, while a corrupted Mr. Game & Watch could become a tall,, distorted, bell-ringing humanoid. The virus is particularly effective against fighters, while robots like R.O.B. might be immune, serving as valuable tools for survival. The overall atmosphere is one of intense dread and survival, with the remaining cast trying to hide from, or research a cure for, the friends they once fought alongside.