When she takes a job babysitting a young boy for a night at his family's remote farmhouse, sweet college co-ed Angie Albright becomes the target of a scar-covered creep making mysterious phone calls and prowling outside the windows. Angie gets the drop on the would-be killer, but quickly discovers that her nightmare has just begun.

Corporate overachiever and all-around fly chick Shanté Smith thinks she's got the goods to keep her slickster boyfriend Keith, from straying—until he discovers a greener pasture, Shanté's archrival, Conny. Scorned, she plans to get her man back by any means necessary.

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?