Captain Blackwood was a Starfleet officer and commander of the Federation starship USS Tombaugh. According to Ensign Stone's personal log of stardate 52188.7, Captain Blackwood ran a tight ship and took special pleasure in tormenting new recruits.
According to Seven of Nine, Captain Blackwood and the Tombaugh were assimilated by the Borg in 2362. (VOY: "Infinite Regress")