is the fourth anime television series in the Digimon franchise, produced by Toei Animation. Unlike the previous series, the main characters can merge with ancient spirits known as the "Legendary Warriors" to become Digimon themselves.

The series aired in Japan from April 2002 to March 2003. An English-language version, produced by Sensation Animation, was broadcast in North America from September 2002 to July 2003 as the fourth and final season of Digimon: Digital Monsters.

Synopsis

Setting In the events prior to the series, ten Digimon creatures from the "Digital World", a parallel universe originated from Earth's various communication networks, sacrificed themselves to seal Lucemon. These Digimon, collectively known as the "Ten Legendary Warriors", created artifacts from their data: the twenty "Spirits" (ten Human and Beast Spirits for the elements of fire, light, wind, ice, thunder, earth, wood, water, metal and darkness), before leaving the Digital World in the care of three Celestial Digimon, Ophanimon, Cherubimon and Seraphimon. When Cherubimon betrays them, Ophanimon summons six children from the human world into the Digital World to become the "DigiDestined".

Plot Takuya, Koji, Zoe, J.P., and Tommy are among several children who receive a text message inviting them to board a train at Shibuya Station. The train brings them to the Digital World. While exploring, the five gain the ability of Spirit Evolution, where they are able to transform into ancient Digimon warriors and meet two guided Digimon named Bokomon and his dim witted sidekick, Neemon. In addition, their cell phones have turned into a type of Digivice (digital device) known as a D-Tector, which they can also purify defeated Digimon by scanning them.

While exploring, the Legendary Warriors learn from Seraphimon that he, Ophanimon, and Cherubimon once maintained order among the human and beast-type Digimon, until Cherubimon became corrupted and urged the rest of the beast-type Digimon to engage with the human-type Digimon in a war. During this time, the Legendary Warriors are forced to fight five other ancient Digimon warriors, one of which Koji learns is his estranged twin brother, Koichi, who was corrupted into Duskmon. Koji manages to purify Koichi, allowing him to join them on their quest to defeat Cherubimon. They rescue Ophanimon while Cherubimon attacks them, but she sacrifices herself to save them and upgrades Takuya and Koji's D-Tectors with the last of her strength to allow them the ability of Unity Spirit Evolution.

After defeating Cherubimon, the DigiDestined learn that Lucemon is sealed within the Digital World's core, and a guide named Baronmon, warns the six Digidestined that the prophecy is that Lucemon will be revived. Two Royal Knights, Dynasmon and Crusadermon, are summoned by Lucemon, and steal all of the world's data to awaken him. The kids attempt to stop the evil knights from scanning the entire digital world, but they fail as they finally free Lucemon. After Takuya and Koji defeat the knights, Lucemon kills them for their failure and absorbs their data to Digivolve into his Chaos Mode. Koichi is revealed to be a digital shade - his physical body is unconscious in the real world after a dangerous fall. Lucemon destroys Koichi's digital form and absorbs his data, which enrages Takuya and allows all the spirits to combine into the ultimate Legendary Warrior Digimon Susanoomon. Though initially defeated, Lucemon Digivolves into his Shadowlord Mode, and arrives in the real world. After reviving Ophanimon, Cherubimon and Seraphimon, Susanoomon successfully destroys Lucemon, restoring the data and the Digital World. The children return to the real world and realize that an hour has not passed since their original departure, and save Koichi by using the power of their D-Tectors, which then revert into cell phones. Takuya and his friends then embrace their future.

Characters Main characters

The leader of the group who uses the Human Spirit of Fire to become salamander-armored Agni-themed , the Vritra-inspired bird of prey/dragon-themed Beast Spirit of Fire to become , and the Hybrid Spirit of Fire to become . The combined spirits allow him to transform him into . Takuya also appeared in the third and final season of Digimon Fusion.

A loner and one of Takuya's friends who uses the Human Spirit of Light to become the wolf-armored , the Beast Spirit of Light to become the Garmr-themed , and the Hybrid Spirit of Light to become . The combined spirits allow him to transform him into .

The only female member of the group who uses the Human Spirit of Wind to become the fairy-themed , and the Beast Spirit of Wind to become the Zephyrus/bird woman-themed .

The oldest of the group who uses the Human Spirit of Thunder to become the Hercules beetle-themed , and the Beast Spirit of Thunder to become the Hercules beetle/tank-themed .

The youngest of the group who uses the Human Spirit of Ice to become the small polar bear-themed , and the Beast Spirit of Ice to become the bear-faced Yeti-themed .

Koji's twin brother, whose existence was kept from one another after their parents' divorce. After arriving at the Digital World, he is manipulated by Cherubimon. He uses a Human Spirit to transform into and a Beast Spirit to transform into the Hræsvelgr-themed . Once Koichi reforms, he uses the Human Spirit of Darkness to become the black lion-armored , and the Beast Spirit of Darkness to become the black lion-themed .

A Digimon befriended by the DigiDestined that wears a haramaki. He would carry a book that contains information on different Digimon and locations.

A yellow rabbit-themed Digimon in baggy pants who serves as the group's comedy relief.

Trailmon Family The Family are a group of train-themed Digimon that serve as a mode of transportation across the Digital World. There are different kinds of Trailmon and most of them occasionally partake in the Great Trailmon Race. The following Trailmon are listed in order of appearance:

An earthworm/train-themed Digimon who was the first Trailmon seen.

An anglerfish/train-themed Digimon.

A Frankenstein's monster/train-themed Digimion.

A buffalo/train-themed Digimon.

A kettle/train-themed Digimon.

A Japanese mole/train-themed Digimon.

A raccoon dog/train-themed Digimon.

A dark and mysterious train-themed Digimon with red lights.

A ball-shaped train-themed Digimon whose arms are attached to the cranks. It only appeared in "Island of the Lost Digimon".

Antagonists

A Celestial rabbit/cherub-themed Digimon alongside Seraphimon and Orphanimon. He was corrupted by Lucemon. The Digidestined are called to the Digital World to stop Cherubimon and restore peace to the land. In a final battle with the Digidestined, Takuya Kanbara as EmperorGreymon defeats Cherubimon. He is later reborn as the rabbit-themed near the end of the series. In the final episode, the redeemed Cherubimon helps the DigiDestined by joining Ophanimon and Seraphimon in giving them the motive to destroy Lucemon.

A prideful, evil Lucifer-themed Digimon and the main antagonist of the series. Lucemon was once a benevolent ruler who brought peace to the Digital World, but became corrupted by his own power and turned into a tyrant. The Ten Legendary Warriors came together to defeat Lucemon and locked him away in the core of the Digital World. Lucemon was able to corrupt Cherubimon and used him to gather the data of the Digital World so that he could be released. Revealed as the true antagonist after Cherubimon's defeat, Lucemon released the Royal Knights to finish his work. Upon his release, Lucemon proved to be more than a match for the DigiDestined until Takuya and Koji formed Susanoomon and apparently destroyed Lucemon. However, Lucemon rose again, but as the fallen angel-themed Lucemon Chaos Mode with both bird and bat-like wings on either side of his body. That is because Susanoomon only succeeded in scanning his good data. During the fight, Lucemon Chaos Mode assumed the form of the dragon-themed Lucemon Shadowlord Mode. With the encouragement of their friends, the DigiDestined formed together into Susanoomon who destroyed Lucemon Shadowlord Mode. However, the larva-themed Lucemon Larva, which contained Lucemon's consciousness and resided in the dark energy sphere carried in Lucemon Shadowlord Mode, survived and attempted a sneak attack. The spirits of the Ten Legendary Warriors emerged from Susanoomon to destroy Lucemon Larva once and for all with the core sword of Susanoomon's cannon. Lucemon has no form of a DigiEgg.

Murmukusmon Darcmon HippoGryphonmon A murmur-themed Digimon who is the main antagonist of "Island of the Lost Digimon". When fooling the Lost Island's human-based Digimon and beast-based Digimon upon having been banished there, Murmukusmon posed as Joan of Arc-themed who led the Human Digimon and the Hippogriff-themed when leading the Beast Digimon. When the Legendary Warriors ended up on the Lost Island, they grew suspicious when neither Darcmon and HippoGryphonmon weren't seen together. When this was exposed, Murmukusmon sheds his disguise and uses the Fractal Codes from the different battles to revive Ornismon. He was destroyed by Agunimon.

An ancient bird-themed Digimon who was sealed away on the Lost Island by AncientGreymon and AncientGarurumon. When he was banished to the Lost Island, Murmukusmon set the Human Digimon and Beast Digimon against each other to harvest the Fractal Codes needed to revive Ornismon. Once that was done, Murmukusmon used Ornismon as a mount. The spirits of AncientGreymon and AncientGarurumon appear upon answering Kotemon's prayers as they destroy Ornismon.

Corrupted Legendary Warriors These are the Human Spirits and the Beast Spirits of the other Legendary Warriors that were possessed by Cherubimon and given to his unknown minions. Duskmon was originally part of this group. Each one was defeated by the DigiDestined and freed Cherubimon's control. During the fight against the Royal Knights, the DigiEggs that were originally associated with these Human and Beast Spirits were briefly reunited and helped to fight off the Royal Knights. The Human and Beast Spirits were part of Susanoomon's final attack on Lucemon Larva.

A troll/gnome-themed Digimon who is the Human Spirit of Earth. His Beast Spirit form is the troll/giant-themed . After losing his Gigasmon form to BurningGreymon, Grumblemon was slain by MetalKabuterimon.

A wooden cyborg-themed Digimon who is the Human Spirit of Wood. His Beast Spirit form is the plant dragon-themed . After the DigiDestined combine their attacks to defeat Petaldramon with Lobomon claiming that Beast Spirit, Duskmon arrived and slew Arbormon while absorbing his Human Spirit.

A Naiad-themed Digimon with fish fin-like ears who is the Human Spirit of Water. Her Beast Spirit form is the sea witch-themed , who possesses a squid-like lower body. She is vain and has admirers of her Human Spirit form, but is upset by the repulsiveness her Beast Spirit. Ranamon becomes Zoe's rival in battle. During the final battle in Sakkakumon, she is slain in her Calmaramon form by Zephyrmon.

A humanoid mirror-themed Digimon with mirror shields who is the Human Spirit of Steel. His Beast Spirit form is the sefirot-themed who has a pocket dimension in each of his spheres with the head being where Mercurymon operates. When fighting Takuya in the Light Sphere, Mercurymon merged with Seraphimon's data to become who sports ten purple demonic wings. Takuya's Aldamon form was able to defeat ShadowSeraphimon in the Light Sphere and Mercurymon in the Steel Sphere. His Sakkakumon form was slain by Aldamon, Kazemon, Beetlemon, and Kumamon when they attacked the Light Sphere that turned out to be his weak spot.

Cherubimon's Army The following Digimon are Digimon that were corrupted by Cherubimon into serving him: