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.

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 "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.

Takuya, Koji, Zoe, J.P., and Tommy are among several children who receive a text message inviting them board a train at Shibuya Station.

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.

Takuya and Koji defeat the knights, Lucemon kills them for their failure then absorbs their data to becomes his Chaos Mode form.

Toei Animation announced the production of a fourth Digimon series in February 2002 and was set to start in April,[2] after Tamers.

[3] Digimon Frontier was conceived by Fuji TV's Go Haruna, Yomiko Advertising's Kyōtarō Kimura, and Hiromi Seki.

[12] An English-language version, produced by Sensation Animation and recorded by Studiopolis, aired in North America as the final season of Digimon: Digital Monsters.

[13] As with previous "seasons", the English version of Frontier featured an original soundtrack and sound effects, character name changes, and content edits pertaining to scenes deemed too inappropriate for young audiences.

[26] A drama CD titled Digimon Frontier: Original Story: What I Want to Tell You (デジモンフロンティア オリジナルストーリー 伝えたいこと, Dejimon Furontia: Orijinaru Sutōrī Tsutaetai Koto) was released on April 23, 2003, and is centered on each of the Legendary Warriors sending messages to each other.