Mirielle Lachance (born July 7, 1939) is a Québec actress mostly known to be the voice of Pruneau in the hit series Passe-Partout, from 1977 to 1992. Mirielle Lachance (born July 7, 1939) is a Québec actress mostly known to be the voice of Pruneau in the hit series Passe-Partout, from 1977 to 1992.