Expanded universe

The term expanded universe, sometimes called an extended universe, is generally used to denote the "extension" of a media franchise (like a television program or a series of feature films) with other media, generally comics and original novels. This typically involves new stories for existing characters already developed within the franchise, but in some cases entirely new characters and complex mythology are developed. This is not necessarily the same as an adaptation, which is a retelling of the same story that may or may not adhere to the accepted canon. It is contrasted with a sequel that merely continues the previous narrative in a linear sequence. Nearly every media franchise with a committed fan base has some form of expanded universe.