Season 1 of Investigative Reports premiered on 1991-09-27.

Season 2 of Investigative Reports premiered on 1992-07-10.

Season 3 of Investigative Reports premiered on 1993-11-26.

Season 4 of Investigative Reports premiered on 1994-07-22.

Season 5 of Investigative Reports premiered on 1995-06-09.

Season 7 of Investigative Reports premiered on 1997-11-29.

Season 8 of Investigative Reports premiered on 1998-11-01.

Season 9 of Investigative Reports premiered on null.

Season 11 of Investigative Reports premiered on 2001-02-12.

Season 12 of Investigative Reports premiered on 2002-04-15.

Season 18 of Investigative Reports premiered on null.

Season 22 of Investigative Reports premiered on null.