A usually sequential media, that only has one installment.
The One Shot has long been a staple of Comic Books, Manga, and Fan Fic. In media that are almost entirely series, it stands out when something only has one instalment. These works are short, sweet, and to the point, but are often overshadowed by larger longer running works. The term comes from the American Comic's industry, but has since spread to other media. They are normally stand-alones, and are completely self contained, but one shot's as part of a larger shared universe are not unheard of. In that case, they are often part of a Fifth Week Event. Not to be confused with One-Hit Kill.