Sicque! Sicque! Sicque! - S1.E9

During an investigation at the Château de Vincennes, Sergeant Deux-Deux clumsily drinks a swig of the formula of a mad scientist and, from then on, transforms at infrequent intervals into a Mr. Hyde-like creature who, in routines, torments and attacks the Inspector (who has no idea that the creature is actually Deux-Deux) upon every transformation.