Can anyone tell me what happened to Quinn? I haven't watched in a while, and see that Remy is the only one left. Where'd everyone go?

In "The Unstuck Man", the four Sliders left one world through the vortex, but something happened. A doctor on a parallel Earth, named Oberon Geiger, was "unstuck", constantly moving between parallel Earths, and he was trying to free himself and help Quinn Mallory from the Earth he was on. That Quinn Mallory had MS, and Geiger planned to cure him by combing Quinns from multiple dimensions into one... but our Quinn, during the slide into their world, got combined. The alternate Quinn became the dominant personality, though he would have occasional flashes of our Quinn's memories and personality. As for developments in "Eye of the Storm", I haven't seen it yet, so... I don't know what that reveals about Quinn (and Maggie nicknamed the new Quinn "Mallory"). I hope you can follow that...

I prefer to pretend that seasons 3 and 5 never happened.

Season 3 has only 2 good episodes : The one where Quinn meets his younger self and the Christmas episode. The rest is just pure garbage.

As for season 5, what they did to Quinn and Wade is a crime, plain and simple.

Fiance and I have been watching through... we just decided to stop at 3. It was bad enough, and after Arturo left...

Have to agree with you, Rene, about the good season 3 episodes.