You may be looking for Star Trek: The Original Series.
When starting a new show, TV producers rarely can anticipate how successful it will be with the audience. But let's assume the show got popular, The Firefly Effect didn't hit it, and a row of sequels is inbound. Now, some producers play it simple and stick with season numbering. But the more creative types go for oddly named sequels and thus, confront the fans with a difficult question: how do you refer to the first show, if its title is already used to refer to the entire franchise? Solution: "The Original Series".
Long time fans may well insist on referring to the original work by the franchise's name.
A subtrope of Retronym.
- Mobile Suit Gundam, though more often referred to as Gundam 0079 or sometimes First Gundam.
- Magical Girl Lyrical Nanoha.
- The Pokémon anime's original series mostly refers to the Kanto arc, though it technically also consists of the Orange Islands arc and the Johto arcs, although in an interesting case, the following series (Pokémon: Advanced Generation) was a direct continuation that followed immediately.
- While the opening theme songs of later seasons are usually referred to by name, the first one is simply called "Pokémon Theme."
- Official sources have retroactively named the first season (as in, the one based on Pokémon Red and Blue, which established the first generation of Pokémon games) Pokémon: Indigo League.
- Used straight, then averted, then used straight again by Pretty Cure.
- The first installment is Futari wa Pretty Cure, and the oddly named sequel was Futari wa Pretty Cure plus a suffix... and so was the first cast reboot. However, later seasons dropped the "Futari wa", making the franchise Pretty Cure and freeing the first season from having to be called The Original Series.
- However, the English, German, Italian and Spanish dubs of Futari wa Pretty Cure are simply called Pretty Cure, which makes it The Original Series all over again.
- Tenchi Muyo! Ryo-Ohki, the OAV episodes, for Tenchi Muyo!.
- Sailor Moon (the Dark Kingdom arc), also known as Sailor Moon Classic.
- The original series of Patlabor OV As was named Mobile Police Patlabor. To distinguish it it from the similarly-named movie and TV series released after, the Laserdisc rereleases added the subtitle Early Days.
- The first Star Wars movie (i.e., Episode IV) was originally titled simply Star Wars on release. The title A New Hope was added with the 1981 re-release (the first one after The Empire Strikes Back), but it wasn't marketed as "Episode IV: A New Hope" until after the prequels were released (even the 1997 Special Edition◊ is called simply "Star Wars: Special Edition"). The fanbase typically used "the trilogy" to refer to the "whole" Star Wars saga prior to the release of Episode I, allowing them to continue calling the first film simply "Star Wars", but this is no longer done any more, and most everyone within the fandom now refers to the original film as "A New Hope" or "Episode IV", and the episodes IV-V-VI as "the original trilogy".
- The original novel about Artemis Fowl was titled simply Artemis Fowl, whereas the rest had various subtitles.
- The first Warrior Cats series was simply called Warriors (or Warrior Cats, depending on where you live), while all the other series and spinoffs have subtitles such as The New Prophecy and Omen of the Stars. Fans usually refer to it as "the original series" or "the first arc", but it was given the official name The Prophecies Begin in a 2015 reprint of the first series.
- The Protomen's first album is simply called The Protomen. After Act II: The Father of Death came out, it retroactively became Act I: Hope Rides Alone.
- Star Trek: The Original Series is probably the most famous example. In fact this very wikiword redirected to it before this page came about.
- Doctor Who's "classic series" refers to the original run from 1963-1989 (and sometimes its TV movie in 1996), to differentiate it from the revival and continuation from 2005. Generally everything before the revival is called "Classic Who" and everything after is "New Who", though the terminology gets fuzzier when applied to the Expanded Universe.
- The Kamen Rider Series has not one, but two shows simply titled Kamen Rider. In an inversion, only the original series has its name untouched.
- The second show with the name, originally intended as a Continuity Reboot but later brought into the existing universe (during the show's run, as part of a Retool), is officially called Kamen Rider (New) in Japan and known as New Kamen Rider among English-speaking fans, though The Other Wiki in both languages calls it Kamen Rider (Skyrider) after a name given to the protagonist during the Retool.
- In the media, the first Law & Order is commonly called the original or the flagship series.
- In Kingdom Hearts, the original game is usually referred to as Kingdom Hearts 1 or KH1 by the fans.
- The first game was just The Legend Of Zelda, and the second was Zelda II: The Adventure of Link, but every game after that was just called The Legend of Zelda: (something). The first game, therefore, can be referred to as "Zelda 1", "the original Zelda", etc. For wiki purposes, we refer to it as The Legend of Zelda, following the Roman numeral designation of the second game.
- A weird case is the Metal Gear series: since the original game is called Metal Gear, the second Metal Gear 2... but the third is Metal Gear Solid, and the series is more referred by that name since practically all later games followed that name (MGS 2/3/4, MGS: Portable Ops, MGS: The Twin Snakes).
- Since Mega Man received lots of spin-offs, the original series are referred to as "Mega Man (Classic)".
- The Core Design produced Tomb Raider games are usually referred to the "Classic" series. Some don't count Angel of Darkness as one of these, and die-hard purists only count the original trilogy.
- After Unreal Tournament 2003 (UT2k3) and Unreal Tournament 2004 (UT2k4) came out, the original Unreal Tournament was called UT99 for its release year.
- Each expansion for World of Warcraft has its own name: "World of Warcraft: The Burning Crusade", "World of Warcraft: Wrath of the Lich King", and "World of Warcraft: Cataclysm." Which leaves players with a conundrum: If someone asks "In which expansion did they add thus-and-such class/race/game-mechanic?", how do you answer when it was added back during the original game run, before the first expansion? Blizzard Entertainment sometimes refers to this time period as "World of Warcraft Classic", but the de facto consensus among the players is to refer to it as "Vanilla World of Warcraft".
- The Super Smash Bros. series has the original title simply referred to as such (as the later titles are frequently referred to by the subtitle, Melee or Brawl instead) or Super Smash Brothers 64 in reference to the console as these games come out at one title per console generation.
- The original Command & Conquer game is referred to as Tiberian Dawn to distinguish it from its sequels.
- Remakes of the original Final Fantasy refer to the game as Final Fantasy I.
- The original PlayStation officially became the "PS1" some time after the PlayStation 2 came out. Previously, it was colloquially called the "PSX", after the abbreviation for its developmental code name, "Playstation-Experimental". Most people will still know what you mean when you call it that, although the especially pedantic will inform you that the PSX was actually an obscure PS2/DVR hybrid sold only in Japan.
- Interestingly, the original Xbox was referred to the "Xbox 1" by most everyone until Microsoft announced their third console, the Xbox One.
- While game series typically get a 1 tacked on for the first one as the second emerges, it's more complicated with Expansion Packs: the expansion is still part of the first game. Another convention to the rescue: base games that have expansions but don't have a subtitle of their own are referred to as vanilla to differentiate from the flavored expansions.
- Scooby-Doo, Where Are You! (the first two seasons) are the original series. The 1978 episodes, which are part of the "The Scooby-Doo Show", are mistakenly labeled as part of the "Where Are You!" series for unknown reasons.
- The Transformers, referred to as "Generation 1" by most fans (after the oddly named sequel Transformers: Generation 2 came out). Hasbro has since started using it themselves.
- This also carries over to another Hasbro franchise, My Little Pony; the initial batch and television show are "Generation 1".
- Ben 10, and it was the only one its creators actually had an active part in running (a different creative duo ran the first two sequels, and another main team runs the fourth.)