The Hirogen take over Voyager
, implant neural implant into the crew, and then use them in WWII battle simulations, where the Voyager
crew act as the Allied force and the Hirogens act as the German force. The Doctor is forced to treat the wounded crew, in order to keep the Hirogen prey alive. However, when Seven is wounded, the Doctor uses her Borg implants to alert her to the real situation going on.
Seven, now aware of the Hirogen presence, must work to defeat them, while the other Voyager
crew are convinced the conflict is real. Seven must do this without making the crew suspicious about her actions, as they may see her as a traitor.