The Sliders are separated on a world where the Hippie movement of the sixties is still alive and the US is at war with Australia. Wade and Rembrandt are mistaken for extraterrestrial prophets at a commune, while Quinn and Arturo race to fix a broken timer and rejoin the others.
“At the sound of the bell you will be four years old.” A hypnotist turns Will into a mischievous little boy.
The Sliders arrive in the British States of America, where Arturo’s double is plotting to assassinate a prince and take the throne. When the Sliders inadvertently foil the plot, they come into contact with a group of rebels trying to bring freedom to America.
Soap bubble: Will is thrilled to land a role in a TV soap – until he finds out his character is in love with another guy.
The Sliders arrive on a world that will be destroyed by an asteroid before they are due to slide. Arturo works with Bennish to develop an atom bomb to destroy the asteroid and Rembrandt gets caught up in an end of the world celebration, while Quinn and Wade confront their feelings for one another.
On a world where penicillin was never invented, Quinn is mistaken for his double, who is believed to be the cause of a massive epidemic. While he is imprisoned by a health agency, Wade shows signs of being infected and only Arturo can find the cure.
While working in his basement, Quinn Mallory opens the gateway to parallel worlds. For a test run, Quinn invites co-worker Wade Welles and his teacher, Professor Arturo, along. Upon opening the vortex, Quinn uses too much power, which causes the vortex to suck them in along with Rembrandt "Crying Man" Brown, who happened to be driving by Quinn's house. The four arrive on a world that experienced an ecological disaster and will have to survive until the timer hits zero.
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.
When Will talks Philip into buying a dilapidated apartment building, guess who has to fix up the fixer-upper.
When two Watchers end up dead by Kalas' hand, Joe realizes that Kalas is looking for Methos, the mythical ""oldest Immortal."" MacLeod knows that, with Methos' quickening, Kalas would finally be strong enough to defeat him. Kalas and MacLeod race to be the first to find Methos. Meanwhile, Richie muscles his way onto a top level motorcycle racing team and the champion, Basil, starts to get nervous. Flashbacks are to Paris in the 1920s, when Kalas, then known as Antonio Neri, was the toast of the opera world. When Kalas threatens a young girl in MacLeod's protection, they fight. Kalas escapes, but not before MacLeod inflicts a throat wound that destroys Kalas' vocal chords and the singing that has been his life since the Middle Ages. Kalas nearly takes Methos in battle and, realizing that he will not be able to defeat Kalas, Methos offers his own head to MacLeod. MacLeod refuses and challenges Kalas on his own, nearly defeating him when the police arrive to send Kalas to prison for the dea