After experiencing a rough slide, Rembrandt and Maggie see Colin is nowhere to be found. More disturbing, they meet a stranger claiming he is Quinn Mallory. Rembrandt and Maggie learn too late that this is all apart of an evil genius' desperate plan to save his life.

Diana tries using a university lab to find a way to separate Quinn and Mallory, which leads to her first encounter with her double, a struggling single mother. Meanwhile, Mallory experiences violent flashbacks from Quinn's life.

The Sliders confront Dr. Geiger again, in a collapsing dimension full of innocent victims.