In an old house filled with old antiques, a nursery rhyme ("Ring a Ring o' Roses") read aloud causes a time fracture that takes away the parents of youngsters Rob and Helen. As Rob (Steven O'Shea), Helen's older brother, tries to call the police, two mysterious strangers calling themselves Sapphire and Steel arrive to fix the problem. Lead also arrives to provide assistance to Steel when the ghosts of the time corridor incapacitate him.