Mademoiselle de Neuf is the café singer and Resistance explosives expert that Seven of Nine is made to play in the Hirogen's simulation of occupied France in The Killing Game.
Mademoiselle de Neuf is the role forced on Seven of Nine in the fourth-season Voyager two-parter The Killing Game, where the Hirogen use neural interfaces to make the crew believe they are people in holodeck scenarios.
In Sainte Claire she sings for German officers at Le Coeur de Lion while serving the Resistance as its munitions specialist. She is the cell's sceptic, impatient with Katrine's caution and inclined to shoot rather than charm the occupiers.
Seven is the first of the group after Janeway to be released from the interface, and has to carry on singing in character to avoid alerting the Hirogen. The scenes are remembered for Jeri Ryan's performances of period songs.