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A recap sequence (or recap, often announced as "Previously on...") is a narrative device used by many television series to bring the viewer up to date with the current events of the stories' plot. It is usually a short (between 20 to 40 seconds) montage of important scenes cut directly from previous episodes, usually short bursts of dialogue, which serve to lay the background for the following episode.
These devices are predominantly seen on episodic series where every installment furthers the plot, but otherwise are used for plot arcs, that is, when an episode is going to pick up on a storyline initiated several episodes ago. A recap will almost always be present in an episode that picks up from a cliffhanger. Recap sequences are most prevalent in dramatic television series (though daytime serials are usually excluded) and reality programs, whereas situation comedies and other scripted genres typically use recap sequences only for two-part or in rare cases, multi-part episodes.
These montages are inserted as the first thing into an episode so that viewers who had not seen the previous episodes or who do not remember what happened can understand from where the current episode will begin, also so that the viewers may decide to catch up on missed episodes, usually buying the DVDs. They usually begin with a voiceover or subtitle proclaiming, "Previously on... [the show's name]" or "Last time on... [the show's name]". Many shows have begun to use a main character's voice for this voiceover rather than a neutral narrator (Chuck), and some series such as Boston Legal and Stargate Atlantis alternate which main character says "Previously on... [the show's name]".
On the Fox show 24, the main character, Jack Bauer's voiceover "Previously on 24..." is followed by scenes from prior episodes of the current season, not necessarily from the very last episode, that concern major plot points of the current episode. This was carried over into 24: The Game, where, once a player completes a mission, all cutscenes prior to that mission can be viewed in the manner of the TV show. The playable scenes are not shown, as the player is given the opportunity to replay them to get a higher score.
On the NBC show ER, main cast members rotate turns saying the phrase "Previously on ER..." which is then followed by scenes from previous episodes which are pertinent to the current episode.
In some cases, the scene leading up to the previous episode's ending is shown instead of a montage. This was common on British television shows from the 1950s to 1990s, although now most adopt a recap montage. An example of this is Doctor Who, which during its original run (1963–1989) used the final scene of the previous episode to begin the next, whereas from the series relaunch (2005–present) the recaps are made up of a collection of short clips.
Recaps are also used for several soap operas, most notably in Australia. The Australian prison soap opera Prisoner (commonly known as Prisoner: Cell Block H) used the a recap sequence throughout its eight-season run. In the early years it only showed the final scene of the previous episode before the opening credits. However, in later years it began to show several select cuts form the previous episode during the recap sequence, often, a new scene would directly follow the recap before the opening credits. In the early years of Australian soaps Home and Away, Neighbours and Sons and Daughters a recap showed directly after the opening credits, which may have been confusing for viewers who would have started watching them, not realizing they were viewing a recap sequence and not a new opening scene. The layout was changed in later years as recaps for Home and Away and Neighbours started before the credits, but currently they again show after the credits in such a way not to confuse the viewer. British soap operas, apart from Hollyoaks, do not use a recap sequence, however, they may be relevant.
In the English dubs of various episodic anime series that suffer editing for time or censorship reasons, recaps are sometimes extended or introduced where they didn't exist originally, to cover any shortfalls in running time. Some examples where this occurs are Robotech, the FUNimation English dub of Dragon Ball Z, and the 4Kids English-language version of One Piece. The original Japanese version of One Piece did not always have recaps, though many episodes did have recaps as the first scene following the opening credits.
There is some debate as to whether these recaps should be considered as part of the episode whole. Some home video and DVD releases of shows that use recaps include them, some do not, and some seem to randomly use or omit them for different episodes within the same collection. A few also place the segment as a full chapter that can easily be skipped if the viewer is viewing the series in a marathon form.