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Gaiden (外伝?, pronounced [ɡaideɴ]) is a Japanese-language word meaning "side story" or "tale", used to refer to an anecdote or supplementary biography of a person. This use of gaiden is commonly used in popular Japanese fiction to refer to a spin-off (canonical or otherwise) of a previously published work that is neither officially considered a sequel nor a prequel. However, some gaiden are retold stories in the perspective of a different character, similar to that of a flashback.
Works that includes the use of the word gaiden in their titles include Fire Emblem Gaiden, Ten no Haō Hokuto no Ken Raō Gaiden (spin-off of Fist of the North Star, which is told through the eyes of Kenshiro's brother, Raoh) or Albert Odyssey Gaiden (released in English as Albert Odyssey: Legend of Eldean). In addition, the word gaiden has been used in English titles as well such as Ninja Gaiden (literally "Ninja's Tale", the American title for the Japanese series Ninja Ryūkenden) and Resident Evil Gaiden (a European-developed spin-off of the Japanese Resident Evil franchise), Super Robot Taisen Alpha Gaiden, which tells a future that would happen without the heroes fighting at the time of need as well as Barkley, Shut Up and Jam: Gaiden (an apocryphal epic detailing the canon account of Charles Barkley, who revives the condemned culture of b-ball to save Neo New York and his son hoopz from the machinations of the traitor Michael Jordan)).
Films such as Battle Royale use the term Gaiden to refer to supplementary or additional works 
- Japanese Translation site provided by the Monash University
- "battleroyalefilm.com". 2008-12-02. Retrieved 2008-12-02.
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it:Gaiden pt:Gaiden ru:Гайдэн zh:外傳