Serials, more specifically known as Movie serials or Film serials, were short subjects originally shown in theaters in conjunction with a feature film that were related to pulp magazine serialized fiction. Known as \"chapter plays,\" they were extended motion pictures broken into a number of segments called \"chapters\" or \"episodes.\"
Each chapter (a typical serial usually had as many as 15 of them) would be screened at the same theater for one week. The serial would end with a cliffhanger, as the hero and heroine would find themselves in the latest perilous situation from which there could be no escape.