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Infinite Regress

Mysteriously, the U.S.S. Voyager comes upon a floating Borg Vinculum - a device that interconnects Drone's minds aboard a Borg vessel - which swiftly causes Seven of Nine to manifest personalities other than her own including that of a Klingon warrior, a Ferengi, and a six-year-old human girl. Janeway is crushed to learn that before Tuvok, The Doctor and she can intervene, Seven may be completely lost.

Voyager, seizoen 5