The writer and philosopher Voltaire decides to take action when he hears of a case of a man being tortured after being accused of murdering his son.
| Actor | Role |
|---|---|
 Alan BadelCapitoul | Capitoul |
 Leonard RossiterVoltaire | Voltaire |
 John PaulCalas | Calas |
 Rosalie CrutchleyMme. Calas | Mme. Calas |
 Alex ScottChalier | Chalier |
 Cyril ShapsMoynier | Moynier |
| TTom CriddleChiseul | Chiseul |
 Richard CaldicotSaint-Florentin | Saint-Florentin |
 Bernard HeptonTronchin | Tronchin |
 Vivienne DrummondMme. Denis | Mme. Denis |
 Peter MacannWagniere | Wagniere |
| EEdwin FinnFather Bourges | Father Bourges |
 Hamilton DyceLaffiteau | Laffiteau |
 Robert JamesAssesseur | Assesseur |
 Pamela CundellMme. Durand | Mme. Durand |
| GGordon FaithBergerot | Bergerot |
| MMichael MundellGorse | Gorse |
| NNan Marriott-WatsonJeanette | Jeanette |
| PPaul ThompsonPierre Calas | Pierre Calas |
| BBrian OsborneLouis Calas | Louis Calas |
| MMatthew LongLavaysse | Lavaysse |
 Royston TicknerTown Crier | Town Crier |