Doug Can't Dance/Doug Gets Busted: The REAL first-aired episode
It turns out that the real first aired episode of the Nickelodeon series was "Doug Can't Dance" (the original 1990 pilot)/"Doug Gets Busted". This is all according to Nick Sayer featured in this website (emphasis mine):
http://www.rugratonline.com/nt91gr.htm
Doug: I liked this one. It was relatively well drawn in a light-line, watercolor style. Jim Jenkins is the principal artist, as far as I could tell. "Doug Can't Dance" and "Doug Gets Busted" were the premiere stories. The show seemed a bit short to me - with only two stories and a bunch of adds. There was a hiden moral in each one, but they didn't pound the viewer over the head with it as is current fashion. Doug looks like it's made for a junior-high age level.
And there you have it. I still consider "Doug Bags a Neematoad" the true beginning of the series, though. share