Seasons

As of 2021, there have been nine series — Digimon Adventure, Digimon Adventure 02, Digimon Tamers, Digimon Frontier, Digimon Savers, Digimon Xros Wars, Digimon Universe: Appli Monsters, Digimon Adventure:, and Digimon Ghost Game. As is obvious from their titles, the first two seasons take place in the same fictional universe, but the third, fourth, fifth and sixth each occupy their own unique world (in the case of Digimon Tamers, the Adventure universe is referred to as a television and commercial enterprise).

Digimon Adventure (Season 1)
The first Digimon television series, which began airing on March 7, 1999. Its premise is a group of young humans who, while at summer camp, travel to the Digital World, inhabited by creatures known as Digimon, where they become the "DigiDestined" and are forced to save both the Digital and Real World from evil. Each child was given a "Digivice" which selected them to be "transported" to the Digital World and was destined to be paired up with a Digimon Partner, for example, Taichi "Tai" Kamiya was paired up with Agumon and Yamato "Matt" Ishida was paired up withGabumon. The children are helped by a mysterious man/Digimon named Gennai, who helps them by hologram. The Digivices help their Digimon allies to "digivolve" into stronger creatures in times of peril. The Digimon usually reached higher forms when their human partners are placed in dangerous situations, such as fighting the evil forces of Devimon, Etemon and Myotismon. The group consisted of seven original characters: Tai Kamiya, Matt Ishida, Sora Takenouchi, Koushiro "Izzy" Izumi,Mimi Tachikawa, Joe Kido, and [http://digimon.wikia.com/wiki/Takeru_%22T.K.%22_Takaishi Takeru "T.K." Takaishi]. Later on in the season, Tai's younger sister Kari Kamiya was introduced as an eighth character.

Digimon Adventure 02 (Season 2)
The second Digimon series is direct continuation of the first one, and began airing on April 2, 2000. Three years later, with most of the original DigiDestined now in high school at age fourteen, the Digital World was supposedly secure and peaceful. However, a new evil has appeared in the form of the Digimon Emperor (Digimon Kaiser) who as opposed to previous enemies is a human just like the DigiDestined. The Digimon Emperor has been enslaving Digimon with Black Rings and Control Spires and has somehow made regular Digivolution impossible. However, five set Digi-Eggs with engraved emblems had been appointed to three new DigiDestined along with T.K and Kari, two of the DigiDestined from the previous season. This new evolutionary process, dubbed Armor Digivolution, helps the new DigiDestined to defeat evil lurking in the Digital World. Some people say Flamedramon was better than Raidramon and vice versa. This was a rivalry that was not included in the Digimon Adventure 2 cartoon. Eventually, the DigiDestined defeat the Digimon Emperor, more commonly known as Ken Ichijouji on Earth, (who is more or less a rival to Davis) only with the great sacrifice of Ken's own Digimon, Wormmon. Just when things were thought to be settled, new Digimon enemies made from the deactivated Control Spires start to appear and cause trouble in the Digital World. To atone for his past mistakes, Ken joins the DigiDestined, being a DigiDestined himself, with his Partner Wormmon revived to fight against them. They soon save countries including France and Australia from control spires and defeat Malomyotismon, the evolved form of Myotismon from the previous season

Digimon Tamers (Season 3)
The third Digimon series, which began airing on April 1, 2001, is set largely in a "real world" where the Adventure and Adventure 02 series are television shows, and where Digimon game merchandise (based on actual items) become key to provide power boosts to real Digimon which appeared in that world. The plot revolves around three Tamers, Takato Matsuki, Rika Nonaka, and Henry Wong. It began with Takato making his very own Digimon by sliding a mysterious blue card on his D-Arc.Guilmon took form from Takato’s sketchings of a new Digimon. (Tamers’ only human connection to the Adventure series is Ryo Akiyama, a character featured in some of the Digimon video games and who made an appearance in some occasions of theAdventure story-line.) Some of the changes in this season include the way the Digimon digivolve, and the way their "Digivices" work. In this season, the Tamers can slide cards through their "Digivices", which give their digimon certain advantages, such as in a card game. The same process is also used to Digivolve the Digimon. Unlike most Digimon series where the tone is set mostly in a way to appeal to young children, Tamers took a darker tone in nature.

Digimon Frontier (Season 4)
The fourth Digimon series began airing in Japan on April 7, 2002, though it rarely aired in the UK. After prompted to do so by unusual phone messages, the five main characters go to a subway station and take a train to the Digital World, to fight the antagonist, Cherubimon and his Legendary Warrior servants before they succeed in dominating the world. Later facing a greater ordeal and threat from Lucemon and his two Royal Knights: Crusadermon and Dynasmon. Contrary to the other Digimon series, the characters do not have Digimon Partners. Instead, they use their D-tectors to transform themselves into powerful Digimon to fight their enemies, another new feature in the series.

Digimon Data Squad (Season 5)
After a three year hiatus, a fifth Digimon series began airing on April 2, 2006. Like Frontier, Savers has no connection with the previous installments, and also marks a new start for the Digimon franchise, with a drastic change in character designs and story-line, in order to reach a broader audience. The story focus on the challenges faced by the members of DATS ("Digital Accident Tactics Squad"), an organization created to conceal the existence of the Digital World and Digimon from the rest of mankind, and solve any Digimon related incidents occurred on Earth in secret. Later, the DATS team is dragged between a massive conflict between Earth and the Digital World triggered by an ambitious human scientist determined to make use of the Digimon to his own personal gains. The English dub premiered on the Jetix block of Toon Disney on October 1, 2007.

Digimon Fusion (Season 6)
After another three year hiatus, a sixth Digimon series was produced. Digimon Xros Wars (デジモンクロスウォーズ  Dejimon Kurosu Wōzu?)[2]  began airing on July 6, 2010,[3] and stars Shoutmon (シャウトモン  Shautomon?), Dorulumon (ドルルモン ?),Ballistamon (バリスタモン  Barisutamon?), Greymon, Monitormon (モニタモン Monitamon?), and Shoutmon X4 (シャウトモンX４  Shautomon Kurosu 4?).[4] [5]  It has two sub seasons: Digimon Xros Wars: The Evil Death Generals and the Seven Kingdoms (<span class="t_nihongo_kanji" lang="ja" style="font-family:inherit;">デジモンクロスウォーズ～悪のデスジェネラルと七人の王国～  Dejimon Kurosu Wōzu: Aku no Desu Jeneraru to Nanajin no Oukoku<span class="t_nihongo_icon" style="font-weight:bold;padding-right:0.1em;padding-left:0.1em;color:rgb(0,0,238);font-size:9px;line-height:normal;font-family:sans-serif;">?) and Digimon Xros Wars: The Young Hunters Who Leapt Through Time (<span class="t_nihongo_kanji" lang="ja" style="font-family:inherit;">デジモンクロスウォーズ～時を駆ける少年ハンターたち～ Dejimon Kurosu Wōzu: Toki wo Kakeru Shounen Hantā-tachi?<span class="t_nihongo_icon" style="font-weight:bold;padding-right:0.1em;padding-left:0.1em;color:rgb(0,0,238);font-size:9px;line-height:normal;font-family:sans-serif;">?)