Premise pilot A premise pilot introduces the characters and their world to the viewer; it is structured so that it can be run as the first episode of the series if substantial changes are not made between the pilot and
greenlighting. In the event the changes being made are so substantial that they would cause confusion to viewers, the pilot (or portions of it) is often re-shot, recast, or rewritten to fit the rest of the series. The pilot for ''
Gilligan's Island, for instance, showed the castaways when they had just become stranded on the island, but three roles were recast before going to series, with the characters either modified or completely altered to the point where the pilot could no longer be used as a regular episode. As a result, CBS aired Gilligan's
second produced episode, which opened with the same scene of the characters just stranded on the island (showing only those not re-cast); the story from the pilot from that point onward was largely reworked into a flashback episode which aired later (with several key scenes re-shot). Even Gilligan's'' theme song, which was originally done as a calypso number, was rewritten and recomposed to be completely different. Another example is
Star Trek, where footage from the unaired original pilot, "
The Cage", was incorporated into the two-part episode, "
The Menagerie", with the story justification that it depicts events that happened several years earlier. Conversely, the second pilot for
Star Trek, "
Where No Man Has Gone Before", aired as the third episode of the show's first season, even though it included some casting and costuming differences that set it apart from the preceding episodes. If a network orders a two-hour pilot, it will usually broadcast it as a
television film to recoup some of its costs even if the network chooses to not order the show. Sometimes, a made-for-TV-movie is filmed as a pilot, but because of actors not being available, the series intro is reshot for the first aired episode. The original
Cagney & Lacey film co-starred
Loretta Swit (of
M*A*S*H fame) as Chris Cagney, but when she could not get out of her contract, they reshot it with
Meg Foster, who after the first season was replaced with
Sharon Gless; therefore, the original movie is not considered part of the television series, and is not included in the series collections on DVD. In some cases, this does not hamper broadcast, such as
Jackie Cooper playing the role of Walter Carlson in the TV movie pilot of the 1975 series
The Invisible Man, but being replaced by
Craig Stevens for the remainder of the series; the pilot is still considered part of the series and released to DVD as such. Likewise,
The Homecoming: A Christmas Story had an almost entirely different cast from the series it was intended to pilot (
The Waltons), but both have been rerun for many years.
Proof of concept A
proof of concept pilot usually takes place chronologically further into a series run than a premise pilot, to give network executives a better feel for how a typical episode would appear (since a premise pilot may have to deviate from a typical episode in order to properly introduce characters).
Remington Steele used both a proof of concept and a premise pilot. Proofs of concept were particularly common for
game shows; in such cases, the pilot may be entirely or partially scripted (and thus, due to regulations passed after the
1950s quiz show scandals, illegal to broadcast in many jurisdictions) and use fake contestants and "returning champions" to demonstrate those concepts. The adventure series
Lassie had both a premise pilot, "The Inheritance", designed specifically to air as the series' first episode, showing how Lassie's series owner, Jeff Miller, came to acquire her; and a proof of concept pilot, "The Well", showcased situations typical to the series, which aired well on into the first season of the series.
Backdoor pilot A backdoor pilot is a film or miniseries that serves as a proof of concept for a full series, but may be broadcast on its own even if the full series is not picked up. The term may also be used for an episode of an existing television show that serves to introduce a potential or already planned
spin-off. Such backdoor pilots commonly focus on an existing character or characters from the parent series who are to be given their own show. For example, a 2018 episode of ABC's 1980s-set sitcom
The Goldbergs, titled "1990-Something", heavily featured teachers who were recurring characters on the series and served as the backdoor pilot to
Schooled, which debuted on January 9, 2019.
Put pilot A put pilot is a pilot that the network has agreed to broadcast either as a special or series; if it does not, it will have to pay substantial monetary penalties to the studio. This usually guarantees that the pilot will be picked up by the network.
Unsold pilot An unsold pilot or "busted pilot" is a produced episode that is never broadcast or made into a television series.
Variety estimated that only a little over a quarter of all pilots made for American television proceed to the series stage.
The Huckabee Show (a spin-off of
Huckabee that aired for six weeks in summer 2010), the final version of
The Jerry Lewis Show, and
The Kilborn File, an unsuccessful comeback vehicle for
Craig Kilborn. In 2021,
Fox Alternative Entertainment utilized a
test market approach for its new reality talent competition format
The Big Deal, producing a season of the series for Irish broadcaster
Virgin Media One with the intent to use it as a pitch for Fox and other broadcasters.
10/90 In a 10/90 production model, a network broadcasts ten episodes of a new television program without ordering a pilot first. If the episodes achieve a predetermined ratings level, the network orders 90 more to bring the total to
100 episodes, immediately enough to
rerun the show in
syndication. Series that used the 10/90 model include
Tyler Perry's
House of Payne,
Meet the Browns,
For Better or Worse,
Debmar-Mercury's
Anger Management, and
Are We There Yet?.
Byron Allen's sitcoms followed a similar model, with
Mr. Box Office and
The First Family airing 26-episode first seasons with the intention of following them up with a full 104-episode order if successful; both series failed to reach the threshold Allen sought, though they remained in limited production (three to four new episodes a year, mixed in with the first season) for a few years afterward.
Other examples An earlier variant was the 13-episode pilot run; in the late 1980s and early 1990s,
Disney Channel notably gave a 13-episode pilot order to two series it never picked up, but would go on to longer runs on other networks:
Good Morning, Miss Bliss (which also had a traditional pilot on
NBC and would be revived by that network as
Saved by the Bell) and the Canadian drama
Hillside (which would move to
Nickelodeon, Disney Channel's primary rival, and air as
Fifteen). ==As distinguished from the series premiere==