In "Infinite Regress", Voyager encounters the wreckage of a Borg vessel, and pick up a piece of technology which attempys to re-assimilate Seven of Nine, causing personalities from other assimilated victims to posess her uncontrollably. In "Nothing Human" B'Ellana is attacked by an injured alien that latches itself onto her body. Voyager's holographic Doctor creates another virtual physician, a Cardassian exobiologist, to treat her.