The teachers and students of a countryside elementary school are thrown into a panic when an air raid siren goes off, warning them of a imminent nuclear attack.

Jane Connell
as Mrs. Maxton

William Daniels
as Mr. Calkins

James Frawley
as Truck Driver

Richard Hamilton
as JoAnn's Father

Kathryn Hays
as Mrs. Betty Forbes

Jane Hoffman
as Mrs. Hayworth

Elena Karam
as Don & Trudy's Mother

Judith Lowry
as Luke's Grandmother

Nancy Marchand
as Mrs. Andrews

Estelle Parsons
as JoAnn's Mother