* January 17, 1990: "Frontiers of Space", hosted by Alan Alda.
* January 24, 1990: "Frontiers of Life", hosted by Alan Alda.
* February 28, 1990: "Frontiers of Matter", hosted by Alan Alda.
* March 7, 1990: "Frontiers of Mind", hosted by Alan Alda.
* May 23, 1990: "Frontiers of Earth", hosted by Alan Alda.
* June 6, 1990: "Frontiers of Energy", hosted by Alan Alda.
* July 11, 1990: "Frontiers of Health", hosted by Alan Alda.
* July 18, 1990: "Frontiers of Computing", hosted by Alan Alda.
* August 22, 1990: "Frontiers of the Future", hosted by Alan Alda.
* September 5, 1990: "Frontiers of Learning", hosted by Alan Alda.
* December 12, 1990: "Frontiers of Medicine", hosted by Alan Alda.