Imagine a world where the events of Exodusnever occurred. No Maggie Beckett, no Rickman and Arturo's deathwould have been avoided . . . . but what if something else had happenedin it's place?
Imagine the events of The Unstuck Man occurredat an earlier date. Imagine Quinn was merged with a double of himself(an identical double) due to an accident in the lab of Dr. Oberon Geiger. Imagine Professor Arturo became "unstuck" (but not the unstuck we know). Imagine that Diana Davis joins our sliders, now consisting of Rembrandt,Wade and Quinn, in an attempt to undo the damage that has been done.
Imagine no more, welcome to Earth 9999 wherethese events did occur!