Mr. Peabody and Sherman find themselves in the midst of the Reign of Terror during the French Revolution. They experience first-hand the hostility of the French people against the aristocrats. Mr. Peabody is about to be executed via the guillotine but manages to escape with a clever and elaborate plan.
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Robespierre struggles to understand the path France is taking and why some people are resisting the revolution. To save the revolution, Saint-Just convinces the other revolutionists that they need to accompany virtue with terror. Terror then becomes entrenched in the Revolution.