The sliders narrowly escape from a world filled with parasitic creatures, but not before Maggie becomes infected. On the next world, the parasite searches for a host in order to reproduce.
On a world where time moves at a slower rate, Quinn encounters his young double and tries to change a traumatic event in his life. Meanwhile, Arturo decides that it's time to grab life by the horns and takes the others on increasingly wild excursions.
The sliders arrive on a world where electrically charged tornadoes have devastated the population. They soon discover a valley protected by lodestone, but the inhabitants of this valley are less than friendly to outsiders.