The final season of the beloved sci-fi series kicks off with Quinn (longtime star Jerry O'Connell) being replaced by Quinn Mallory, aka Quinn2 (Robert Floyd), a fraternal double who shares DNA with the original Quinn, thanks to an experiment by Dr. Oberon Geiger (Peter Jurasik). Along with newcomer Diana Davis (Tembi Locke), Quinn2 joins sliders Rembrandt Brown (Cleavant Derricks) and Maggie Beckett (Kari Wuhrer) for a last round of adventures.