High Quality Content by WIKIPEDIA articles! A "television pilot" (also known as a "pilot", "pilot episode", and "series premiere") is a standalone episode of a television series that is used to sell the show to a television network. At the time of its inception, the pilot is meant to be the "testing ground" to see if a series will be possibly desired and successful and therefore a test episode of an intended television series. It is an early step in the development of a television series, much like pilot lights or pilot studies serve as precursors to the start of larger activity, or pilot holes prepare the way for larger holes. Television networks use pilots to discover whether an entertaining concept can be successfully realized. After seeing this sample of the proposed product, networks will then determine whether the expense of additional episodes is justified. They are best thought of as prototypes of the show that is to follow, because elements often change from pilot to series. Variety estimates that only a little over a quarter of all pilots made for American television succeed to the series stage, although the figure may be even lower.