I'd delete about 70% of Sliders
I'd start changing it in the second season to have better scripts so John Rhys-Davies wouldn't get so fed up with them.
I would absolutely not have the Kro-maggs in the series, Arturo would not be killed off, and there would be no Maggie or any of the boring characters that came after her.
And I'd have an episode in which they slide into a world where everything was Greek (there was a throwaway line in one episode where Rembrandt grumbled that if they ended up in a Greek-speaking world, the Professor and Quinn would be the only ones who could understand anything).
I actually started writing a fanfic based on that... and made it a campy crossover with Xena: Warrior Princess. The basic background is that Alexander the Great didn't die young; he conquered the entirety of Asia to the Pacific, and kept on going to the New World. Fast-forward 2300 years, and there you have California with all the trappings of ancient Athens (sorry,
@Kyriakos, but this is Xena I'm talking about, where none of the history-related episodes are remotely accurate
).
Oh, and Ares takes exception to Arturo informing him that the Greek gods were just myths. Arturo finds out otherwise. *evilgrin*