S1·E33 The Virus Factory!
Aired October 21, 2002
Synopsis
A strange acid rain and viruses loom over NetCity, destroying it. MegaMan and co. jack-in to fend off the viruses, and they soon discover an underground factory that's the source of the mayhem. But when MegaMan goes to destroy it, he meets ShadowMan, an assassin NetNavi hired to delete him.