Agumon, Gaomon, and Lalamon's partners, along with the rest of the city's population, have been placed in a magical slumber by mysterious, thorned vines that spread throughout the city. As the Digimon make their way through the silent city, they stumble upon a pack of Goblimon led by an Ogremon, who are attacking a young girl. After they scare off the goblins, the girl, Rhythm, reveals that she is actually a Digimon, and that the thorns are the work of a Digimon named Argomon. The quartet sets out to confront the villain atop his skyscraper nest.
On the way to the castle, Gaomon stays behind to hold off an army of Goblimon. After Lalamon flies Agumon and Rhythm near the top of Argomon's lair, she stays behind as well to hold off an attacking swarm of Pipismon. Agumon and Rhythm find Argomon at the top of the tower, spreading his vines throughout the city. Argomon seems too strong for Agumon to face at first, but Agumon's "Spitfire Blast" is able to knock the creature out. However, Argomon digivolves to its Mega form and turns the tide of the battle. After Agumon takes a severe beating and is just about to give up, he remembers how Marcus would never give up, no matter what, and this determination frees Marcus from his coma. Marcus arrives at the scene and punches Argomon to activate his D.N.A., which he uses to digivolve Agumon to ShineGreymon. Despite faring better against Argomon, ShineGreymon is still not strong enough to win the battle, and Argomon shatters his GeoGrey Sword. In response, Marcus just becomes more determined, evoking the Burst Charge, which is supplemented by Rhythm's wish for ShineGreymon to win. With these, ShineGreymon digivolves to ShineGreymon Burst Mode, and impales Argomon through the chest with his sword, killing the evil Digimon. After the battle, Rhythm gives Agumon a kiss.
- Taiki Matsuno as Agumon
- Kazuya Naki as Goamon
- Yukana as Lalamon
- Akiko Yajima as Rhythm
- Soichiro Hoshi as Marcus Damon
- Hanawa as Argomon
- Kenta Miyake as Orgemon
- Satoshi Tsuruoka as Goblimon #1
- Toshinobu Iiba as Goblimon #2
- Shintaro Ohata as Goblimon #3
- Kazunari Kojima as Goblimon #4
- Marcus, Thomas and Yoshi don't appear until the climax of the film.
- Marcus is the only human that speaks in the film.
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