I might be wrong, Maxfan, but this is what I remember about Sliders.
1st, the professor gets killed by Colonel Rickman, and Maggie is the new slider.
2nd, Wade's transferred to another dimension's birthing camp, and later is just a head in a jar in a kromagg lab.
3rd, Quinn finds his brother Collin (sp?).
4th, Collin's lost in a slide and Quinn's genetically combined with his fraternal twin from another dimension.
5th, Diana joins the sliders.
6th, Rembrandt keeps sliding.
Now, I might have missed a few episodes during those seasons, but I think that's how it went. If there were other episodes where the group members changed again, please correct me. It's been about a year since I've seen the show so my memory might be a little off.:rolly2: