In the United States, one-shots are usually labeled with a "#1" despite there being no following issues, and are sometimes subtitled as "specials". On occasion, a character or concept will appear in a series of one-shots, in cases where the subject matter is not financially lucrative enough to merit an ongoing or limited series, but still popular enough to be published on a regular basis, often annually or quarterly. A current example of a series of one-shots would be Marvel Comics' "" publications. This type of one-shot is not to be confused with a comic book annual, which is typically a companion publication to an established ongoing series.