This is basically my spin on the idea presented by @Bomster. With my own creative differences. Nintendo-Sony The year was 1988, and video games were strong, but the industry was a duopoly, mainly dominated by the massive and venerable Nintendo, and the smaller but just as influential Sega. However, many more wanted to enter this lucrative piece of the entertainment industry's pie. Among them was the Japanese electronics firm Sony. Interested in entering the lucrative gaming industry, Sony sought an entry, but was unsure how to do so with any degree of success. Which is why Sony decided that instead of entering the industry as a freshman, they would enter it with a senior. And that senior was Nintendo, a company whose mascot, Mario, was on par with Mickey Mouse in sheer recognizability. The original idea began when Sony presented a sound chip for use on Nintendo’s upcoming Super Nintendo Entertainment System console. Upon its introduction, Nintendo was impressed and proposed a new disc-based add-on for the Super Nintendo called the SNES-CD, that would harness the power of CD’s to boost the system’s power to unprecedented heights. However, it was ultimately decided to have the SNES use CDs from the start. The deal was an incredible one, but in early 1989 it almost all fell apart. Nintendo found that Sony planned to have complete ownership of all games on the new console, which made the Nintendo higher-ups enraged. It was at this moment that everything could have gone awry, but in the end the deal was revised and completed by June that year. Under which the two companies would split profits from the console itself. Whereas the profits of each game depended on which studio agreed to publish it. At last, the Super Nintendo Entertainment System (SNES) was released just in time for Christmas 1990, selling far better than ever expected. The SNES would go on to harbor some of the greatest games ever made, such as the Super Mario World trilogy, The Legend of Zelda: A Link to the Past and The Legend of Zelda: The Dream Temple, the original Star Fox duology, the Donkey Kong Country quartet, and The Secret of Mana, and is often considered to be some of the greatest consoles ever made. By the time 1994 rolled around, it was clear that the decision to partner with Nintendo was a wise one, as money was pouring into both company's pockets. However, the major game changer came when Sony complained it was not getting enough of the profits from the games. It took three days of negotiation among the two companies, but in the end it was decided that the two should merge so all revenue from the games produced could go equally to Nintendo and Sony. Leading to the brand name Nintendo-Sony. With that crisis averted by early 1995, it was time to make the next console. The brilliant minds at Nintendo and Sony, building off of the Super Nintendo, created a new console that was specifically envisioned as a disc-based machine. That new console was the revolutionary PlayStation (PSN). Released in 1997, the PlayStation revolutionized the gaming industry forever by wowing gamers everywhere with its realistic (at least for the time) graphics, and making 3-D graphics the new standard for all game consoles from that point on. This console would famous become known for its major game changing titles such as the Super Mario Ultra duology , Mario Kart Ultra, Legend of Zelda: Ocarina of Time/Majora's Mask, Edison & The Dreamers , Banjo-Kazooie, the original Mario Party trilogy, Final Fantasy VII, Metal Gear Solid, Starfox 3, Ultra Metroid, PaRappa the Rapper, Spyro the Dragon, Crash Bandicoot, and Goldeneye 007. This console was also praised for being able to play SNES games through backwards compatibility. Their next console, the GameCube (GCN), was decent. But at that point, Sega had returned to the forefront through becoming a major subsidiary of Apple. Whereas Microsoft had launched the brand-new Xbox. Despite this, the two companies managed to give out several contemporary classics like the Metroid Prime duology, Pikmin, Super Mario Director, Final Fantasy X, Kingdom Hearts, Kameo, Super Mario RPG: The Millennium Door, and The Legend of Zelda: Twilight Princess. Whereas other games like Super Mario Sunshine, The Legend of Zelda: The Wind Waker, Luigi's Mansion, and Mario Kart: Double Dash were initially more divisive for playing more loosely with the formula. (For instance, Wind Waker changed the world of Hyrule into a series if islands in an ocean). However, most of the games that were received hostilely at first have become Cult Classics over time, or have simply been given their deserved accolades retroactively. This game continue the tradition of backwards compatibility by playing SNES and PSN games. Nintendo-Sony would get back on their knees with the creation of the Nintendo Warrior (WRN). Which became famous for its innovation of motion controls in games such as The Legend of Zelda: Imperial Guard, The Legend of Zelda: Skyward Sword, Super Mario Shift,  Super Mario Galaxy, Super Mario Inc, LittleBigPlanet, Banjo-Kazooie: Gruntilda's Ghost, Donkey Kong Country Returns, and Mario Kart: Speed Demons. That said, these games always had the options to be played with more conventional controls like Batman: Arkham, Super Mario RPG: Melody of the Guardians, and Return of the Dreamers were still nonetheless well received. This era is also loved for rebooting Spyro as the Dragon as The Legend of Spyro, which clearly inspired later Mario games with deeper lore. Again, backwards compatibility for all past consoles. The next console, the Union (UNN) was the brand's weakest point. But despite being the least profitable of the brand's systems it still enjoyed a few diamonds in the rough. Such as Super Mario Maker and Donkey Kong Country: Tropical Freeze, which are both considered some of the finest side-scrolling platformers ever made. As well as Super Mario Galaxy 2, which revitalized the villain Tatanga from Super Mario Land. This console also introduced the iconic series Splatoon, which was Nintendo EAD's first new IP for years. Starfox fans also remember this era for their work to fully incorporate Rare's Dinosaur Planet games into the two series' Shared Universe that was first established in Star Fox Assault on the GameCube. On the Sony side, The Last of Us was very loved, as was Ratchet & Clank with franchises like Jak and Daxter and Final Fantasy. Unfortunately, Zelda fans were left out as the only major titles were remakes of the PSN and GCN titles. Again, backwards compatibility for all past consoles. Today, the brand has made a handheld-home console hybrid known as the Leviathan (LVN). Known for stellar titles like Legend of Zelda: Breath of the Wild and Super Mario Odyssey. It was a bonafide success, and many games from the weaker Unity have been ported or are receiving sequels soon. In addition, installments like further ones in the Final Fantasy franchise. Again, backwards compatibility for all past consoles. Overall there really is a light at the end of the tunnel, and we can expect the Nintendo-Sony empire to never die.  The Super Mario Ultra duology introduced two fan favorites among Mario fans. The first being the operatic pirate boss Captain Heckbeard of the Pineapple Pirates. Where as the second introduced Prince Cream, the younger brother of Princess Peach and a powerful psychic.  ITTL, the crew behind Conker ultimately puts their character in Edison & The Dreamers, allowing Banjo-Kazooie to remain a platformer.  TTL's version of OTL's Super Paper Mario.  What's worth noting is how Imperial Guard began on the GCN to be for Twilight Princess what Majora's Mask was to Ocarina of Time. But then, it developed into a completely new game for the Warrior.