Physics genius Quinn Mallory has been tooling around in his basement for months, trying to create an anti-gravity device. However, he has stumbled on to something much greater - something that appears to be a gateway! Curious as to what's on the other side, he invites his old friend Wade Wells and his physics teacher, Professor Maximillian Arturo, to venture into the gateway with him. While creating the gateway, however, Quinn uses too much power, and the vortex snags a fourth passenger: Rembrandt Brown, a former pop star who just happened to be in the neighborhood. The vortex drops them in a world where a new Ice Age has begun, a world where they must somehow survive until Quinn's timer reaches zero!.

Just as Fred gets ready to cave in and return home, Roseanne comes to regret sticking her nose in where it doesn't belong by trying to reunite him with Jackie.

After barely escaping the last world, the Sliders think they are home. But to their horror, Quinn and Arturo learn they are not and have instead arrived on a world where the Soviet Union rules America. Rembrandt has been arrested for trying to use American money and the only way to save him is for the others to help a group of revolutionaries rescue their imprisoned leader.

A bomb at a construction site kills a 12-year-old boy, and the suspects include the bankrupt contractor and a jealous husband.