A platonically wed American couple run a lunar weather station near an unwed Soviet couple.
| Actor | Role |
|---|---|
 Jerry LewisPete Mattemore | Pete Mattemore |
 Connie StevensEileen Forbes | Eileen Forbes |
 Robert MorleyHarold Quonset | Harold Quonset |
 Dennis WeaverHoffman | Hoffman |
 Howard MorrisSchmidlap | Schmidlap |
 Brian KeithGen. 'Howling Bull' Hallenby | Gen. 'Howling Bull' Hallenby |
 Dick ShawnIgor Valkleinokov | Igor Valkleinokov |
 Anita EkbergAnna Soblova | Anna Soblova |
| MMargaret TeeleStella Mary | Stella Mary |
 Sig RumanRussian Delegate | Russian Delegate |
 James BrolinTed Robertson | Ted Robertson |
 Linda HarrisonPeggy | Peggy |