Can you tell the difference between fact and fiction? Several stories of strange, mysterious and incredible occurrences are chronicled during each episode. It is up to the viewer to decide which stories actually happened and which were completely fabricated by the show’s writers. The answer is revealed by Jonathan Frakes at the conclusion of each episode.

Following the arrest of her mother, Ramona, young Vanessa Lutz decides to go in search of her estranged grandmother. On the way, she is given a ride by school counselor Bob Wolverton. During the journey, Lutz begins to realize that Bob is the notorious I-5 Killer and manages to escape by shooting him several times. Wounded but still very much alive, Bob pursues Lutz across the state in this modern retelling of Little Red Riding Hood.

In his basement in San Francisco, boy-genius Quinn Mallory unlocks the doorway to an infinite number of Earths. During a test run, Quinn invites co-worker Wade Welles and his teacher Professor Maximillian Arturo to see his new invention. But an increase in power and an early departure leave all three, plus a washed-up soul singer named Rembrandt "Crying Man" Brown, lost in a parallel world. Now they must "slide" from world to world, not only adapting to their changing surroundings, but also trying to get back to their world. Will they ever make it home?