This Movie has three parts. The first part sets before the events of the first TV series when Tai and Kari find a digi-egg in their own home.
The second part sets after the first series and before the second series when Tai, Matt, T.K. (Matt's younger brother) and Izzy fight against a digimon on the internet that causes chaos throughout the world.
The final part sets after the second series where T.K.,KaRI, Cody, Yolei (Cody's older sister) and Davis to help a kid who keeps being tracked down by an evil digimon But Kari and T.K. end up being delayed so it's up to the remaining kids to help out