The third season of the serial crime-thriller television series Millennium commenced airing in the United States on October 2, 1998, and concluded on May 21, 1999 after airing twenty-two episodes. It tells the story of retired FBI Agent Frank Black. Black had previously worked for a private investigative organization, the Millennium Group, but left after the Group unleashed a virus that resulted in the death of Black's wife. Now working for the Federal Bureau of Investigation with agent Emma Hollis, Black seeks to discredit and expose the Group for their sinister motives.

Frank Black is a fictional character in the crime-thriller television series Millennium. Black serves as the primary character of the series, which centers on his investigation into unusual crimes as part of the private investigative organization the Millennium Group. Black appeared in all but one of the series' sixty-seven episodes, with "Anamnesis" being the exception; the character was portrayed by Lance Henriksen throughout the series.