A wistful or excessively sentimental yearning for return to or of some past period or irrecoverable condition.
My job on this blog is to make you Nostalgia all over the place, every day.
I have a bootlegged DVD collection of the entire series. (They never released an official version.) As for why it was canceled: I know there was some controversy over a few lines. (I forget what exactly, but I think, "Shut up Dag!" was one.) And then there was an unaired last episode where they broke the fourth wall, and complained about getting cancelled. Nickelodeon didn't like it because they have/had a policy not to directly tell the audience that a show is ending.