Dex finally returns home from Jawaii Island, where for months he's been in training with the ex-World Three gang to become the ultimate NetBattler. Meanwhile, things are heating up in DenTech City as BurnerMan unleashes a hot blast of chaos throughout the town. The Darkloid has crippled the natural gas system as part of ShadeMan's nasty plan for domination. Lan and MegaMan spring into action, but they're interrupted by Dex and GutsMan--on a mission of their own to try out their new so-called skills. Dex joins forces with Lan to stop BurnerMan's rampage, but only because he wants to defeat Lan himself! Have the old friends become new enemies--or is Dex just dazed and confused?

When weather man Vic is fired for constantly making inaccurate forecasts, he stumbles upon BubbleMan who is now selling custom-built miniature-sized CopyBots. Vic decides to use one so that his NetNavi ElementMan can manipulate the weather, and he experiments at a public swimming pool that Lan is attending with his friends.