Star Trek: 10 Things You Didn’t Know About Wolf 359
5. Wolf 3-5-And-Seven-of-Nine
In Infinite Regress, Voyager's proximity to a malfunctioning Borg vinculum caused Seven of Nine to manifest the identities of various assimilated individuals. Amongst them was the mother of Lieutenant Gregory Bergan, an officer aboard the USS Melbourne. She was supposed to meet him at Wolf 359.
Caught in the battle, we can only assume Bergan's mother was captured in her escape pod. And though, at one point in the episode, Seven does refer to the emergent personalities as "[her] victims," there is no reason to believe she was directly responsible for their assimilation. Lieutenant Bergan's exact fate also remains unknown.
There is a bigger mystery behind all those who were confirmed assimilated at Wolf 359 — a list to which we can add Doctor Riley Frazier of the USS Roosevelt (from Unity), and Laura, last name and ship not given (from Unimatrix Zero and Unimatrix Zero, Part II). As Captain Picard noted to the Borg Queen in Star Trek: First Contact, "that ship and all the Borg on it were destroyed". Her Majesty could rely on non-three-dimensional methods, but how did the others escape the exploding cube?
The Star Trek: The Next Generation novel Greater than the Sum (2008) gives a simple enough answer: "[Before the cube's destruction at Sector 001], some of the assimilated Starfleet personnel were sent back to the Delta Quadrant in a scout sphere". More recently, the trailer for the upcoming JTVFX project Wolf 359: The Massacre II (to be released in full on 24 September 2025) also featured Doctor Frazier and Laura, in this case, pre-assimilation.