The Mobile Suit Variations, simply known as MSV to fans, are variations on the mechanical designs seen in the anime Mobile Suit Gundam; specifically those of the Universal Century during a period known as the One Year War. These mobile suit variations are official designs, and included detailed histories and in many cases even have detailed backstories given for their pilots. Some were meant for a cancelled original series in 1983, and a few were even originally intended to appear in Mobile Suit Gundam, but their appearances were cut due to storyline alterations. While never seen in their own animation series, most of the MS models (as well as the backstories and pilots created for them) are considered canonical, and a few were later seen in other side-stories, manga, or video games. In a few cases, MSV designs even made brief appearances in Zeta Gundam and Gundam ZZ.