The Kapitän is a holographic German officer in the Hirogen's simulation of occupied Sainte Claire, lover of the Resistance member Brigitte and a fervent believer in his nation's supposed superiority.
The Kapitän is a holodeck character in the fourth-season Voyager two-parter The Killing Game, part of the Second World War programme that the Hirogen run with Voyager's crew as unwitting participants.
A regular at the café Le Coeur de Lion, he is involved with Brigitte, the role played by B'Elanna Torres, and is the father of the child she is carrying. He does not realise that she is passing what he tells her to the Resistance.
His speeches about a master race destined to rule make an impression on the young Hirogen Turanj, who is impatient with his own commander Karr's plan to use holography to change Hirogen society. When the simulation spreads through the ship, the Kapitän and his troops become a danger to crew and hunters alike.