one-shot

In comics, a one-shot is a work composed of a single standalone issue or chapter, contrasting a limited series or ongoing series, which are composed of multiple issues or chapters. One-shots date back to the early 19th century, published in newspapers, and today may be in the form of single published comic books, parts of comic magazines/anthologies or published online in websites. In the marketing industry, some one-shots are used as promotion tools that tie in with existing productions, movies, video games or television shows.

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