A newly-arrived army chaplain is put in charge of camp entertainment and has the idea of putting on a Brains Trust with local notables. Unfortunately for him, it emerges from a question on the rights and wrongs of marriage that there is more going on between three of the panelists than he wants to know about - though the audience obviously thinks differently.
| Actor | Role |
|---|---|
 Alastair SimCapt. William Paris | Capt. William Paris |
 Elizabeth AllanAngela Prout | Angela Prout |
 Roland CulverGeorge Prout | George Prout |
 George ColeSoldier in Brains Trust audience | Soldier in Brains Trust audience |
 Colin GordonProfessor Mutch | Professor Mutch |
 Martita HuntLady Dodd | Lady Dodd |
 Janet BrownJessie | Jessie |
 Peter MartynWalter | Walter |
 Miles MallesonDr. Hector McAdam | Dr. Hector McAdam |
 Edward ChapmanJoseph Byres M.P. | Joseph Byres M.P. |
 Cyril ChamberlainDrill Sergeant | Drill Sergeant |
 Michael RipperDrill Corporal | Drill Corporal |
 Robin BaileyIntellectual Corporal | Intellectual Corporal |
| MMichael KellyStaff Sergeant | Staff Sergeant |
| PPatrick WestwoodSoldier in Pub | Soldier in Pub |