History LastEpisodeNewCharacter / LiveActionTV

** Also, while she wouldn't become a regular for another couple of years, Donna first appeared at the end of the Season 2/28.

Times where [[LastEpisodeNewCharacter the final episode introduces a new character]] in LiveActionTV series.

* Mike gets introduced in the last episode of ''Series/BreakingBad's'' second season and becomes a regular in the next season.

* ''Series/ICarly'' had Carly and Spencer's father appear near the end of the series finale. He had been away on an extended tour with the United States Air Force.
* ''Series/LittleHouseOnThePrairie'': The final two episodes of Season 9 introduced two new characters that were possibly intended to become regulars, with the hopes the show would have been renewed for a 10th season. Alas, that wasn't the case, and aside from appearances in the three follow-up movies (which comprised the unofficial "10th season"), there was virtually no time to flesh out and truly develop their characters. Those characters, by the way, were:
** Rachel Brown, who marries Willie Oleson in the second-to-last original episode, "May I Have This Dance." Had the series been renewed, their stories would have revolved around her learning to get along with her mother-in-law (the dastardly Mrs. Olesen) and becoming part of the town. A "newlywed" story ''was'' dedicated to her and Willie in the finale, "Hello and Goodbye" (which aired the following week), but from there her appearances were fairly limited in the follow-up movies, as more time was spent on Albert and Charles (in the two non-Christmas movies), and on Laura and Almonzo (in the holiday flick). On top of this, actress Katherine [=MacGregor=] did not choose to return for any of the specials and her absence was HandWaved by Harriet going off to visit relatives and coming down with a prolonged sickness; thus, there was no further conflict to be had (some might be thankful for that). Then the final movie effectively broke up the entire cast and sent whole of Walnut Grove to other lands.
** Sherwood Montague, the eccentric Englishman who settles in Walnut Grove in the final 60-minute episode, "Hello and Goodbye." Undoubtedly, his plots would have involved the clashes of culture and adjusting to life in small-town Minnesota. His time is limited in "The Last Farewell," although he does make a sizable appearance in "Bless All the Dear Children" (a plot centering on his cynical attitude toward Christmas softening, thanks to little Jason Carter).
* ''Series/JonathanStrangeAndMrNorrell'' has the Raven King, John Uskglass show up in a non-speaking (but important) role in the final episode. A painting of him was scene in a previous episode and he was mentioned in nearly every episode but only showed up in person for the last.
* ''Series/{{Smallville}}'': With its constant rumours of being cancelled, it has a lot of these. ''Vessel'' (season 5) had General Zod. ''Phantom'' (season 6) had Bizarro. ''Doomsday'' (season 8) had Major Zod (long story). ''Prophecy'' (second-to-last episode of entire series) had several evil extras who do absolutely nothing just like ''Film/SupermanIVTheQuestForPeace'': Solomon Grundy, Captain Cold and Black Manta.
* ''Franchise/PowerRangers'':
** Nova Ranger shows up halfway through the final episode of ''Series/PowerRangersSPD'', apparently because they remembered at the last minute that they had a spare costume left over from ''[[Series/TokusouSentaiDekaranger Dekaranger]]''.
** At the end of ''[[Series/PowerRangersNinjaStorm Ninja Storm]]'', {{Exp|y}}ies of the Wind Rangers as they were at the beginning of the season appeared to help out. They don't appear again, but the [[Series/PowerRangersDinoThunder next season]]'s Red Ranger is basically the goofiest member of this trio given a new hair color. He's eventually [[HandWave handwaved]] as being his twin brother, [[PlayingTheirOwnTwin as they were played by the same actor]].
** Tanya Sloan made her first appearance in the two-part finale of Season 3 of ''Series/MightyMorphinPowerRangers''. She ended up becoming the new Yellow Ranger in ''Series/PowerRangersZeo'' and the first part of ''Series/PowerRangersTurbo''.

* Several of the Doctor's regenerations in ''Series/DoctorWho'' take place at the end of a series. The ones to debut right at the end of a series are the Fourth, Fifth, Tenth, Eleventh, Twelfth and Thirteenth Doctors. (The Second Doctor is sentenced to forced regeneration at the end of season 6, but we don't see the Third Doctor until the beginning of the following season in 1970) Although the new Doctor is technically the same individual, in terms of personality and actor they're fundamentally a new character.
** Also, while she wouldn't become a regular for another couple of years, Donna first appeared at the end of the Season 2/28.
** The War Doctor ''technically'' counts due to appearing at the end of Series 7B and comprising a major {{Cliffhanger}} going into the 50th anniversary special, and because the Eighth Doctor shows up for one more outing in a mini-episode that is effectively his last story, where his long-unexplained regeneration finally takes place into said incarnation of the Doctor.
** Of all the people to show up, ''SantaClaus'' appears at the end of Series 8 as an unexpected arrival in the TARDIS. Or perhaps not unexpected, as by then it had become standard practice to set up the yearly Christmas special at the end of each series of the revival era ''Doctor Who''.
* Ryan on ''Series/JoanOfArcadia'', who would have played a big role in the third season, had there been one.

* During the final episode of the ''Series/MetalHeroes'' series ''Series/SpaceSheriffGavan'', the baddies are ganging up on Gavan and are about to win when a new Sheriff suddenly pops up to even the score. He turns out to be Sharivan, the new hero of the upcoming sequel show ''Series/SpaceSheriffSharivan'', which would start airing the next week. Also, surprisingly, he would turn out to be a character that had been featured before. A previous victim of the day who had been sent to the Sheriff planet for treatment several eps before and forgotten about.
* On ''Series/{{Lost}}'':
** Ana Lucia had a flashback cameo in the first season finale before returning in the second episode of the second season as a regular.
** Jacob's appearance at the end of Season 5 also qualifies. ''Lost'' actually does this a lot during season finales, even with locations and situations rather than people, in part due to the disjointed order of the narrative.

* Teased, but ultimately averted (because RealLifeWritesThePlot) in ''Series/That70sShow''. Charly was introduced towards the end of the seventh season as a future SuspiciouslySimilarSubstitute for Eric, but as the actor had landed another role before the season eight premiered, his character was [[DroppedABridgeOnHim unceremoniously killed off]] and was only seen in flashbacks in the season 8 premiere episode.
* In ''Series/{{Charmed|1998}}'', [[KidFromTheFuture Chris]] was introduced in the final two-parter of the season five. He was a regular character during season six.

* Percival was introduced in the last episode of season three of ''Series/{{Merlin|2008}}''. And season four does it again, introducing Tristan and Isolde in the first part of the season finale. Tristan survives, but Isolde is killed in the second part's battle.
* Zaf was introduced in the last episode of season three of ''Series/{{Spooks}}'' and became a regular for the fourth series.
* The third season finale of ''Series/HolbyCity'' introduced the new ward sister, Chrissie Williams. She remained on the show more or less continuously for over twelve years, making her one of the show's longest serving characters.

* Mike gets introduced in the last episode of ''Series/BreakingBad's'' second season and becomes a regular in the next season.
* ''Series/GossipGirl'': Ivy Dickens was introduced as a guest character late in the show's fourth season and her true identity wasn't revealed until the final episode of the season. She would return as a regular the next season thanks to the departures of two other cast members.
* The season two finale of ''Series/TheNeighbors'' introduces a new human family that moves into the neighborhood after all the Zabvronians except the Bird-Joyner Kershees have left, hinting at a change of format for the show. Unfortunately, the show wasn't picked up for a third season.
* ''Series/{{Grimm}}'''s Season 1 ended with the reveal of the identity of the huntress who was stalking Akira throughout the episode (and kicked his ass): Kelly Burkhardt, single mother and legendary Grimm:
-->'''Kelly''': Nick, NICK, NICK, CALM DOWN. It's me.
-->'''Nick''': Mom?!
* ''Series/TwoPointFourChildren'' had the last episode of Series 7 introduce [[CousinOliver Declan]], a homeless child whom the Porters foster after their daughter leaves for university.
* The Season 2 fall finale of ''Series/{{Gotham}}'' features a [[TheStinger stinger]] in which we see an innocent man getting chased into an alley by an unknown assailant. Eventually, it's revealed that the man chasing him is none other than [[spoiler:Mr. Freeze]].
* The GrandFinale of ''Series/DowntonAbbey'' introduced Bertie's mother Mrs Pelham as a last-minute obstacle to the match between him and Edith.

* The last scene of the third season finale of ''Series/TheBigBangTheory'' introduced us to Amy Farrah Fowler, who became a series regular in the following season.
* ''Series/HowIMetYourMother''[='=]s titular mother, while mentioned throughout the show's run, does not make a proper appearance until the Season 8 finale. TheReveal of her name does not happen until a season later during the last minutes of the GrandFinale.
* ''Series/GameOfThrones'':
** Hot Pie and Lommy Greenhands make their debut in the Season 1 finale. Jaqen H'ghar also debuts here, though the one who will reappear later is implied to be a different character wearing the same face. Furthermore, the dragons are officially introduced in the Season 1 finale after Dany successfully hatches their eggs in the funeral pyre.
** Ternesio Terys was introduced during the Season 4 finale.
* ''Series/{{Arrowverse}}'':
** Kendra Saunders aka Hawkgirl makes her debut in the Season 1 finale of ''Series/TheFlash2014''.
** [[ComicBook/{{Hourman}} Rex Tyler aka Hourman]] makes his debut in the Season 1 finale of ''Series/LegendsOfTomorrow''.
** Behrad Tarazi suddenly replaces his sister Zari in the timeline at the end of Season 4 of ''Series/LegendsOfTomorrow''.
** ComicBook/BoosterGold is introduced in the final episode of season 7 of ''Series/LegendsOfTomorrow''. He was meant to be a regular in season 8, but the show was {{cancelled}}.
** The GrandFinale of ''Series/{{Arrow}}'' introduces John Byrne, a criminal who tries to kill Oliver Queen's son William as revenge for the former putting him in jail eight years prior.
* ''Series/TheWalkingDead'':
** Michonne makes her debut in the Season 2 finale.
** Gareth makes his debut in the Season 4 finale.
** Negan makes his debut in the Season 6 finale.
* ''Series/OneTreeHill'':
** Peyton Sawyer's biological mother makes her debut in the Season 2 finale.
** Jamie, Nathan and Haley's first son, makes his debut in the Season 4 finale.
** Lucas and Peyton's daughter makes her only appearance in the Season 6 finale.
* ''Series/JessicaJones2015'': District Attorney Samantha Reyes makes her debut in the Marvel Netflix shows in the season finale of ''Jessica Jones'' before having a recurring role in season 2 of ''Series/Daredevil2015''.
* The Season 7 finale of Series/ShamelessUS has Monica's father, Bill, come to town to not only beat on Frank, but also give his daughter a proper funeral.
* After being noticeable by her absence throughout the entirety of ''Series/BlackSails'' (this being a show that features all the other famous figures during the Golden Age of Piracy), Mary Read is ''finally'' introduced in the very last minutes of the GrandFinale.
* ''Series/{{Supernatural}}'':
** Season 1's finale introduces longtime fan-favorite Bobby Singer, a [[ParentalSubstitute surrogate father figure]] to Sam and Dean who would continue to accompany them on their adventures throughout the series.
** While unseen, Season 4 ends with Lucifer being freed from {{Hell}}.
** Originally, it was intended for Season 5 to be the last season of ''Supernatural''. ArchangelMichael and ArchangelRaphael were established as being the commanders of {{Heaven}} within the first few episodes, Meg Masters, a demon from Season 1, gets brought back with a [[TheNthDoctor new vessel]], and the HorsemenOfTheApocalypse wreak havoc on the world. However, the best example of this from Season 5 is Crowley, the King of the Crossroads and originally meant to play a smaller role as a demon who aids Sam and Dean, who would later become the King of Hell after Season 5 and a recurring BigBad, with his actor, Creator/MarkSheppard, eventually being promoted to regular status.
** The last few episodes of Season 8 introduce the Scribe of God, Metatron, who usurps Crowley and Naomi as Season 8's BigBad in the finale, by casting all of the angels out of Heaven and closing its gates.
** [[AndThenJohnWasAZombie Dean gets reborn as a demon]] after dying in the Season 9 finale.
** [[PrimordialChaos The Darkness]] is revealed to be the ultimate BigBad of ''Supernatural'' and the original source of evil within the series in the Season 10 finale, and is freed from the Mark of Cain in the final moments of the episode.
** Lady Toni Bevell and a British chapter of the Men of Letters are introduced in the finale of Season 11. Mary Winchester is also resurrected by Amara AKA The Darkness in the final moments of the episode.
** Season 12 takes this to the logical extreme, by introducing an entirely new dimension where the Apocalypse came to pass, and where Angels and Demons are locked in a constant war, with humanity caught in between, complete with a parallel counterpart of Bobby Singer. And in the last few minutes of the episode, the {{Nephilim}} child of Lucifer, Jack, is BornAsAnAdult.
** The very last episode of the series introduces Sam's son Dean Winchester II, who was born after Sam retired from being a hunter.
* Series/{{ER}} had several new interns, including one played by Creator/AlexisBledel, show up in the series finale, as a way of showing that life in the ER would continue.
* The three-part series finale of ''Series/TheFosters'' is set a few years after the last full season. Stef and Lena are fostering yet another child.
* ''Series/{{Alias}}'':
** The final scene of the first season finale has Sydney come face to face with her supposedly-dead mother (played by an extra standing in shadow, as the role wasn't cast until the first episode of the next season), a major figure in the remainder of the show.
** More obliquely, the season 2 finale featured a TimeSkip where Sydney lost two years of her life - the cliffhanger final scene included the revelation that Vaughan got married while she was 'dead', with his wife becoming a main character in season 3.
* ''Series/CobraKai'':
** The Season 1 finale has Johnny returning home after winning the Karate Championship and finding his old sensei, Mr. Kreese. He becomes a major character in season 2, taking over the dojo with his aggressive teaching methods.
** The Season 2 finale episode ends with Johnny getting a Facebook friend request from Ali, Daniel's high school girlfriend not seen since ''Film/TheKarateKid1984''.
* ''Series/TeenWolf'': the flash forwards in the finale introduce Alec, a young werewolf chased by hunter who gets recruited by Scott for his pack.
* ''Series/RobinHood'': With star Jonas Armstrong leaving after the third season, in the last three episodes the creators introduced a [[CanonForeigner hitherto unknown]] half-brother named Archer who would be [[SuspiciouslySimilarSubstitute the main character]] in season 4. The third season was widely despised and hemorrhaged ratings, however, so... a new protagonist wasn't needed after all.
* ''Series/Loki2021'' The Season 1 finale has Loki and Sylvie meet with He Who Remains, the true power behind the Time Variance Authority. He explains that he's been pruning alternate timelines in order to prevent more malevolent Variants of himself from coming into existence. When Sylvie kills He Who Remains anyways, freeing the multiverse, the last shot of the show is of Loki looking in horror at a statue of the Variant that's arisen to take control of the TVA, Characters/KangTheConqueror.
* ''{{Series/Vikings}}'' did this several times through-out it's run.
** During the production of season 1, the showmakers realized what an asset [[spoiler: Travis Fimmel as [[DoomedByCanon Ragnar Lothbrok]] was]], and decided to postpone his fate to season 2. His fate had already been hinted at in the season and the show was setting up the conflict between him and [[spoiler:Aelle]] which instead is abruptly concluded in episode 7 with a SequelHook at the end. In episode 8 and 9, new characters and conflicts are introduced and escalates but are not resolved until season 2. The new characters also allowed the showmakers to keep [[spoiler:Ragnar]] alive until season 4 having them as the season finale instead.
** Season 5 introduces Gunnhild and then Olaf very late into the massive 20-episode season, both who have a pretty big impact on the cause of events.
** Season 6, the final season, introduces Erik the Red literary out of nowhere as an all purpose character. This seems to be because writer Micheal Hirst did not have the foresight to add (and keep alive) any character that could do what he does earler. This causes him to be a very jarring character who's personality completely changes out of nowhere. Then there is the character of Naad, who appears in the last 5 episodes so Ubbe's final arc can have an antagonist.
* ''Series/VikingsValhalla'' introduces [[TheDreaded Sweyn Forkbeard]] in episode 7, and fills the space of his son Canute who gets PutOnABus in the last two episodes.

** Season 6, the final season, introduces Erik the Red literary out of nowhere as an all purpose character. This seems to be because writer Micheal Hirst did not have the foresight to add (and keep alive) any character that could do what he does. Then there is the character of Naad, who appears in the last 5 episodes so Ubbe's final arc can have an antagonist.

* ''Series/VikingValhalla'' introduces [[TheDreaded Sweyn Forkbeard]] in episode 7, and fills the space of his son Canute who gets PutOnABus in the last two episodes.

* The third season finale of ''Series/HolbyCity'' introduced the new ward sister, Chrissie Williams. She has been on the show more or less continuously ever since, making her the show's longest serving character.

** Similar to the ''Ultra Fight Orb'' example above ''Series/UltraGalaxyFightTheAbsoluteConspiracy'' revealed in TheStinger that a mysterious Ultraman had been captured by The Kingdom. It wouldn't be until almost a year later when we learn that his name is Ultraman Regulos, who is set to make his proper debut in ''Series/UltraGalaxyFightTheDestinedCrossroad''.

* The final episode of ''Series/{{Ultraman}}'' introduced Zoffy, Ultraman's superior officer from Nebula M78. Zoffy goes on to become a key recurring character in subsequent [[Franchise/UltraSeries Ultra shows and movies]].
** ''Series/UltraGalaxyFightTheAbsoluteConspiracy'' revealed in TheStinger that a mysterious Ultraman had been captured by The Kingdom. It wouldn't be until almost a year later when we learn that his name is Ultraman Regulos, who is set to make his proper debut in ''Series/UltraGalaxyFightTheDestinedCrossroad''.

* ''Series/{{Smallville}}'': With its constant rumours of being cancelled, it has a lot of these. ''Covenant'', last episode of season three, had Kara Zor-El who turned out to be a fake. ''Commencement'' (season 4) had Brainiac in the form of a black ship. ''Vessel'' (season 5) had General Zod. ''Phantom'' (season 6) had Bizarro. ''Doomsday'' (season 8) had Major Zod (long story). ''Prophecy'' (second-to-last episode of entire series) had several evil extras who do absolutely nothing just like ''Film/SupermanIVTheQuestForPeace'': Solomon Grundy, Captain Cold and Black Manta.

* ''Series/RobinHood'': With star Jonas Armstrong leaving after the third series, in the last three episodes the creators introduced a [[CanonForeigner hitherto unknown]] half-brother named Archer who would be [[SuspiciouslySimilarSubstitute the main character]] in series 4. The third series was widely despised and hemorrhaged ratings, however, so... a new protagonist wasn't needed after all.

** While unseen, Season 4 ends with [[spoiler: Lucifer]] being freed from {{Hell}}.

** The last few episodes of Season 8 introduce the Scribe of God, Metatron, who [[spoiler: usurps Crowley and Naomi as Season 8's BigBad in the finale, by casting all of the angels out of Heaven and closing its gates.]]