Digimon Adventure Temporada 1 Episódio 1

While preparing for the upcoming school camp, Taichi Yagami is visited by his new neighbor Koshiro Izumi when they learn that Tokyos electronic systems have gone haywire, including the citys trains with Taichis younger sister Hikari and their mother trapped in one. The two youths run to the nearby station where Taichi is suddenly transported to another world located inside the internet, encountering a wounded Digimon called Koromon. Upon making contact with Koromon, Taichi gains a Digivice while Koromon evolves into Agumon. Koshiro, who also obtained his own Digivice, contacts Taichi and informs him that a horde of Digimon called Argomon are responsible for the chaos with Taichi and Agumon battling them to save the formers family. Though the remaining Argomon evolves into more powerful forms before overpowering them, Taichi and Agumons determination triggers the latters evolution into Greymon.