In the middle of a performance of the play "Le Cocu", a bad boulevard comedy at a Parisian theatre, Yannick gets up and interrupts the show to take the evening back in hand.

On a cursed island ravaged by a strange plague called "the Malaise," a king commissions his alchemists to develop a cure to save his people from the disease... but the antidote turns the kingdom's inhabitants into monsters! The king decides to create an army using this formula, but the situation quickly spirals out of control.