Teenager Chris Parker would rather party with her boyfriend, but when her beau breaks their date she reluctantly accepts to babysit Brad and Sara Anderson and their annoying sex fiend neighbor Darryl. When her friend Brenda's marooned at a downtown bus station with very seedy characters around. Chris, Brad, Sara, and Darryl get into the parents' station wagon for a trip to the inner city. All is well until the flat tire..