Recap sequence

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.