Series starters, also known as OPENERS, are the first episodes of a television series. They are designed to introduce the characters, setting, and plot of the show. The term 'series starters' is used to describe the opening episodes of a television series, which are typically longer than regular episodes and often feature a cliffhanger ending. Series starters are important for introducing viewers to the world of the show and setting up the story for the rest of the season.