The Borg make frequent appearances in Star Trek: Voyager, which takes place in the Delta Quadrant, the region of the galaxy from which the Borg are believed to have originated. The Borg are first discovered by Voyager in the third - season episode "Blood Fever ''. Chakotay discovers the body of what the local humanoids refer to as "the Invaders ''; which turns out to be the Borg. In "Scorpion '', the Borg are engaged in a war of attrition against Species 8472, whose biological defences, developed as a feature of their evolution in fluidic space, are a match for the Borg 's nanoprobes. In one of the few instances of the Borg negotiating, in exchange for safe passage through Borg space, the Voyager crew devises a way to destroy the otherwise invulnerable Species 8472. A Borg drone, Seven of Nine, is dispatched to Voyager to facilitate this arrangement as Captain Janeway refuses to allow the Borg to use neural implants for communication with the Voyager crew.
when do the borg first appear in voyager
the third - season episode "Blood Fever ''