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.
| Actor | Role |
|---|---|
 Jane ConnellMrs. Maxton | Mrs. Maxton |
 William DanielsMr. Calkins | Mr. Calkins |
 James FrawleyTruck Driver | Truck Driver |
 Richard HamiltonJoAnn's Father | JoAnn's Father |
 Kathryn HaysMrs. Betty Forbes | Mrs. Betty Forbes |
 Jane HoffmanMrs. Hayworth | Mrs. Hayworth |
| EElena KaramDon & Trudy's Mother | Don & Trudy's Mother |
 Judith LowryLuke's Grandmother | Luke's Grandmother |
 Nancy MarchandMrs. Andrews | Mrs. Andrews |
 Estelle ParsonsJoAnn's Mother | JoAnn's Mother |
| DDoug ChapinGary | Gary |
 Miles ChapinJoel | Joel |
| BBozo DellPeter | Peter |
| DDianne HigginsJill | Jill |
| AAlan HowardLuke | Luke |
| CChristopher HowardSteve | Steve |
| DDavid KomoroffDon | Don |
| DDonnie MelvinBrian | Brian |
| SSusan MelvinTrudy | Trudy |
| LLinda MeyerJoAnn | JoAnn |
 Alice PlaytenHarriett | Harriett |
| MMarilyn RogersSarah | Sarah |
| JJennifer StonePattie | Pattie |