That's an interesting question
I'd have to say Galaxy Rangers. It had a great concept, good heroes and villians(Scarecrow!), and some decent stories. Looking back, though, the writing could have been a lot better and with today's animation some of that stuff would look a lot cooler.
So that's what I'd do. Bring it back with better writers. Bring in guest writers every week. People like Dini, Timm, Joss Whedon, Mcfarlane, David Brin, William Gibson, Harlan Ellison, etc.
And make the show an hour-long.
Wow, I wish I could do that!
"Jack the sound barrier. Bring the noise!"-Rat Thing from Neal Stephenson's Snow Crash
"I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain." -Bene Gesserit litany against fear