Digimon Season 4: Digimon Frontier (50 episodes)

VietLang

Digimon Season 4: Digimon Frontier

Plot: The biggest feature introduced in the season is "Spirit Evolution", where the Digi-Destined themselves evolve into Digimon to become Legendary Warriors, rather than having partners. For this special kind of evolution, they use "spirits," artifacts created by the Ancient Warriors that were hidden in certain areas of the Digital World. When the characters first arrive in the Digital World their cell phones turn into digivices called D-Tectors(D-Scanners in the Japanese version). Each character actually acquires two spirits each, the "human spirits" and the stronger "beast spirits," and some transform into even stronger forms by being able to use their two spirits at once and ultimately by combining all the team's spirits together. Another detail different from the previous seasons lies in the way the characters travel within the regions of the DigiWorld: most areas are connected by railroads, where train Digimon called "Trailmon" act as a means of transport.

When the five Digi-Destined arrive in the Digital World, they find themselves hunted by five other Legendary Warriors that serve the evil Cherubimon. After they defeat four of the enemy, Koji discovers that Duskmon, the fifth evil Legendary Warrior, is really his estranged brother Kouichi. With Takuya's help, Koji is able to free his brother, and Kouichi restores the Spirits of Darkness to their true forms and joins the team as the true Warrior of Darkness, Löwemon. After they defeat Cherubimon, the Digi-Destined learn that the true mastermind was Lucemon, an ancient, evil, angel Digimon whom the Ancient Warriors sealed away. So now the Six Digi-Destined must defeat his two Royal Knights before they scan away all of the Digital World, which would allow Lucemon to be free.