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This talkative and unevenly paced feature finds Fou (Jean Lefebvre) the inventor of a gas that makes the users fall in love. He is chased by his boss, the police, and spies, who seek to secure the secret recipe for their own selfish purposes. A shadowy American underworld figure tries to intimidate the inventor. A half-hearted attempt at comedy tries to go along with the double dealing and trickery of the thin plot of the film.

Jean Lefebvre
as Eugène Ballanchon, scientific researcher, single

Maria Latour
as Régine, Mr. Beauchard's spy

Bernard Blier
as Mr. Beauchard, executive secretary linked to a gang

Michel Serrault
as Mr. Granger, director of the scientific laboratory

Pierre Tornade
as DST inspector

Pierre Brasseur
as Father Ballanchon

Margo Lion
as Mrs. Ballanchon, Eugène's mother

Le Fou du labo 4
November 29, 1967 · 1h 30m
This talkative and unevenly paced feature finds Fou (Jean Lefebvre) the inventor of a gas that makes the users fall in love. He is chased by his boss, the police, and spies, who seek to secure the secret recipe for their own selfish purposes. A shadowy American underworld figure tries to intimidate the inventor. A half-hearted attempt at comedy tries to go along with the double dealing and trickery of the thin plot of the film.

Jean Lefebvre
as Eugène Ballanchon, scientific researcher, single

Maria Latour
as Régine, Mr. Beauchard's spy

Bernard Blier
as Mr. Beauchard, executive secretary linked to a gang

Michel Serrault
as Mr. Granger, director of the scientific laboratory

Pierre Tornade
as DST inspector

Pierre Brasseur
as Father Ballanchon

Margo Lion
as Mrs. Ballanchon, Eugène's mother