History Main / SignatureSeriesArc

** Anime/PokemonTheSeriesDiamondAndPearl

** ''Anime/PokemonJourneysTheSeries:'' The Masters Eight Tournament, for the rather obvious reason that it's a tournament where Ash competes with Lance, Steven Stone, Cynthia, Iris, Diantha, Alain and Leon, and in the end [[spoiler: he makes his way to the finals where he defeats Leon and becomes the World Champion.]]

* ''Manga/Reborn2004'': The Varia arc is the most remembered of the series and where author's shift to action improves greatly with some unique villans and battles ending in very memorable climax.

** In the second millennium, important story arcs include ''ComicBook/NewAvengers'', ''ComicBook/SecretInvasion2008'' and in ''ComicBook/TheAvengersJonathanHickman'' -- ''ComicBook/{{Infinity}}'' and ''ComicBook/TimeRunsOut''.

* ''[[ComicBook/CaptainBritainACrookedWorld A Crooked World]]'' is generally regarded as ''the'' singular most important story for ComicBook/CaptainBritain ever. Aside from marking a major GrowingTheBeard point for the character, it also introduced almost all the aspects and characters that would come to define the series, such as the [[AllianceOfAlternates Captain Britain Corps]], Omniversal Majestrix Saturnyne, Otherworld, the Fury, and Mad Jim Jaspers. On a larger level, the Marvel Universe's wider lore for the multiverse in their comics - all the way down to the idea of designation numbers for realities - got it's start with this arc.

** ''ComicBook/CivilWar2006'' remains Marvel's biggest-selling event. It completely altered the status quo of the Marvel universe while also defining the characters and stories of several key players for more than a decade.

** ''ComicBook/SecretWars1984''. The first major event comics and best-seller. It provided many iconic story and character beats and likewise introduced elements such as the Symbiote costume of Spider-Man that led in turn to ComicBook/{{Venom}}--a character who has since become a major successful spin-off character. It also led in turn ''ComicBook/SecretWars2015'', a spiritual sequel that was likewise a landmark storyline for Marvel in TheNewTens.

** ''ComicBook/TheSupergirlFromKrypton2004'' was the storyline which reintroduced Kara Zor-El in the modern DC Universe after remained exiled from continuity for eighteen years. The story arc was popular enough to be adapted into an animated movie: ''WesternAnimation/SupermanBatmanApocalypse''.

* ''Series/Charmed1998'' has the Cole storyline in the first half of Season 3 -- a half-human demon sent to infiltrate the sisters and then falling in love with Phoebe for real. It helps that it's the show's most popular season, and it became a StarMakingRole for Creator/JulianMcMahon.

** Season 6, particularly near its end, has become sort of iconic due to marking the first major step the show took after it [[OvertookTheManga Overtook the Novels]]. In particular, "Battle of the Bastards" is iconic not just for the eponymous battle, but also its aftermath marking the Starks ''finally'' [[ThrowTheDogABone retaking their home of Winterfell]] and Ramsay Bolton getting a [[KarmaHoudiniWarranty long overdue and very satisfying]] KarmicDeath. The following episode and SeasonFinale, "The Winds of Winter" is also just as iconic due to having Cersei, Jon, and Daenerys consolidating their positions but also finally [[spoiler: revealing the truth about Jon's parentage and confirming the long-standing "Rhaegar + Lyanna = Jon" theory that had been floating around the community for a long time]].

* ''Series/Merlin2008'' has the development towards Morgana's FaceHeelTurn in Season 2; starting with her realising that she has magic, her half-sister Morgause turning up and Merlin eventually poisoning her to save the rest of Camelot. The last part is especially controversial, and has been the subject of much discussion regarding the treatment of Morgana's character.

* ''VisualNovel/UminekoWhenTheyCry'': The very end of "Banquet of the Golden Witch" and its follow-up with "Alliance of the Golden Witch" and "End of the Golden Witch." The first is notable for [[spoiler: the introduction of Ange Ushiromiya into the plot]], the following for [[spoiler:Ange's heartbreaking past and journey with the Seven Sisters of Purgatory, the additional backstory for Maria and introduction of Sakutaro, the all-out Red Truth VS Blue Truth battle between Beatrice and Battler at the end, and TheReveal that Bernkastel and Lambdadelta have been in cahoots as the true villains of the story]], and the final for its particularly twisted Rokkenjima gameboard mystery thanks to [[spoiler: Lambda taking over as Game Master]], the debut of Erika Furudo and the Inquistion of Heresy, [[spoiler: the lengthy trial sequence that results in Beatrice's titular end, and the extended aftermath where Battler learns the whole truth of everything and transforms into the Golden Sorcerer, taking ownership of the game from Erika after a thrilling battle.]]

* For ''WebAnimation/{{RWBY}}'', it's easily the original Beacon arc from Volumes 1-3. Not only did it introduce the world and characters and was the [[OnlyTheCreatorDoesItRight only arc with input from]] Creator/MontyOum prior to his passing, but its culmination in the climax of Volume 3 which featured [[spoiler: Beacon's destruction, Yang losing an arm, Ozpin and Pyrrha being KilledOffForReal, Team RWBY splitting apart and the true BigBad being revealed]] is widely considered a ToughActToFollow for every subsequent arc finale.

* ''[=WebAnimation/SMG4=]'' has Waluigi Arc, which many fans hold in high regard for being [[GrowingTheBeard the point]] where the series officially [[DarkAndEdgier changed from comedy to dramedy]].