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Season 1 - Sep. 28, 1987
Season 2 - Nov. 21, 1988
Season 3 - Sep. 25, 1989
Season 4 - Sep. 24, 1990
Season 5 - Sep. 23, 1991
Season 6 - Sep. 21, 1992
Season 7 - Sep. 20, 1993

Star Trek: The Next Generation Season 6 Episode 20
HD
Overview:
Stardate: 46731.5. Picard’s old archaeology professor is found murdered, the crew try to complete his research. Soon, the crew must compete with Romulans and Klingons and Cardassians to uncover the truth behind his discoveries.