Tai thinks that Kari may be the eighth child, but he quicklly changes his mind when she doesn't really seem to know much about the digimon.  Tai's cat Miko knocks a digivice out the window. That night, a digimon named Raremon shows up by the beach. While on his computer, Izzy gets an email from Gennai who tells him that he must go after this Digimon himself since everyone else is asleep. Suddenly, Izzy receives a singal from that eighth digivice. Izzy decides to look for the digivice while Tentomon goes after Raremon. Raremon is soon defeated, but a crow picks up the digivice and takes it back to its nest before Izzy is able to locate it.

When BlackWarGreymon destroy the third stone, a digimon briefly appears and BlackWarGreymon becomes convinced that this is his worthy opponent. At the next site, despite Angemon digivolving to MagnaAngemon after he touches the Stone, the Destined lose the battle. Gabumon tells the children about Agumon's discussion with their foe.

Gennai again appears and tells the kids that there is an eighth DigiDestioned and that Myotismon is planning to go to the Real World with an army of evil Digimon to find him/her. The kids infiltrate Myotismon's castle in an attempt to stop him from opening a gate that will allow him access to the Real World, but fail when Gatomon animates a series of Devidramon statues.

Yolei, while on a school trip, encounters BlackWarGreymon and several other digimon in the real world after the mega just destroyed a second Destiny Stone. Ken brings her Poromon, who helps her to combat the digimon until they are suddenly brought back to the Digital World.

Matt, Gabumon, Joe, and Gomamon are being forced to work at Digitamamon's diner to pay off a meal. DemiDevimon sets off a series of accidents that makes Matt question Joe's friendship. Matt overcomes his feelings when Joe is willing to sacrifice himself to save T.K. Matt's Crest glows and Garurumon digivolves into WereGarurumon and defeats Digitamamon.

BlackWarGreymon has a discussion about life with Agumon. Arukenimon and Mummymon turn their attention to the fabled Destiny Stones, damaging one with Knightmon (another creation of Arukenimon) and somehow causing BlackWarGreymon great pain in the process.

The discovery of T.K.'s Crest of Hope reveals a cave engraved with Digi-code. Izzy receives an e-mail from Datamon asking for help from within Etemon's headquarters, which is a large upside down pyramid. Datamon promises them that if they free him, he will show them Sora's Crest. After he is freed, however, he escapes and kidnaps Sora. He intends on making a copy of her so that he can control Biyomon.

While searching for Gatomon's tail ring, Yolei, Kari, Ken, and their Digimon stumble into the Dark Ocean. When they are attacked by Blossomon, another of Arukenimon's creations, Gatomon and Aquilamon DNA digivolve into Silphymon.

The kids arrive in a Koromon village overrun with Pagumon, who trick the kids and kidnap Tokomon. Etemon learns of the arrival of the DigiDestined and confronts them. He uses his Dark Network to prevent the Digimon from digivolving and then traps the group inside a cave where they discover their first Crest, Tai's Crest of Courage.

While Cody's doubts towards Ken causes Ken to leave the group, Mummymon and Arukenimon combine a hundred control spires to create BlackWarGreymon. Even after Yolei brings Ken back to the group so they could form Paildramon, BlackWarGreymon effortlessly defeats the DigiDestined, but refuses to finish the job, and instead leaves Mummymon and Arukenimon, to search for a "worthy opponent."

After suffering an attack from Ogremon at sea, Joe and Gomamon find themselves on an island with Sora and Biyomon. They are captured by a band of Bakemon intent on eating them. Gomamon and Biyomon manage to escape and digivolve to fight the Lord Bakemon. They eventually defeat him with help from Joe's repetitive chanting.

Yolei creates a counter to the strange woman's music (because she worked with Matt's band). She transforms into a Digimon called Arukenimon and a fight breaks. As the gang is about to defeat her, another digimon, Mummymon, sweeps in to save her.

Takato is depressed after Henry and Rika have previous commitments and can't go Digimon patrolling, but he feels better when he goes with Guilmon to play with his school friends. But soon the Snake Deva Digimon, Sandiramon, attacks leaving Rika and Henry to fight it on their own, until Impmon helps out and tells Takato they need him.

The DigiDestined arrive at the giant Giga House, where the strange woman lies in wait. As they draw closer to her, the group is attacked by different kinds of insect digimon. When they find the spider woman, however, she uses her flute to take control of Stingmon and Digmon as well.

Cody, Yolei, Davis, T.K, Kari, Izzy and Sora go to the Digital World. Yolei and Cody get their partners (Hawkmon and Armadillomon). Davis and Veemon get captured by the Digimon Emperor, and the others must save him.

Paildramon and Okuwamon continue fighting. Ken puts his crest of kindness into a slot in the base, but it does not do anything. Paildramon destroys the base entirely, and Izzy explains DNA digivolving and the story of how the original DigiDestined gave up the powers of their crests, which is why their Digimon can't digivolve to ultimate level anymore.