A Starfleet crew member of the USS Equinox who survives that ship's destruction and is taken aboard Voyager in 2376, stripped of rank and placed under supervision.
Brian Sofin belongs to the crew of the Nova-class USS Equinox, commanded by Captain Rudolph Ransom and stranded in the Delta Quadrant by the Caretaker in the same way as Voyager. His story is told in the two-part Voyager episode Equinox.
By the time the two ships meet, the Equinox crew have been killing nucleogenic life forms and converting them into fuel to shorten the journey home. Sofin is one of those who went along with Ransom's orders and with the later attempt to abandon Voyager to the creatures' revenge.
At the end of Equinox, Part II he is one of five survivors transported to Voyager before the Equinox explodes. Captain Janeway names him with Marla Gilmore, Noah Lessing, James Morrow and Angelo Tassoni, reduces them all to crewman and warns that her trust will have to be earned.