still getting nostalgia rushes from this stuff. Almost 10 year anniversary. Absolute fire.
oh also @Rougeblast, that thing before D-bug was something from a little special episode that was made..between 47 and 48 I think? It used to be hosted on one of Kirbopher's older sites, as well as opening animations for all 4 seasons (the 4th OP being the only finished product of season 4 more or less) and I don't know if it's still floating around anymore, which is unfortunate. However some people may have posted mirrors and there's always fan wikis/TVtropes pages/etc. But before you even look for those I can tell you what I remember; it was some other virus named Flux, which was the antagonist in that episode, and combating it involved the Webmaster rewriting the Antivirus program data (which is what Alpha references a moment later here after you see it). It also involved Alpha and Zetto fusing, if I recall correctly, and that's also referenced later on. If you wander back on here and look at this I hope this answers your question!