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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 12
HD
Overview:
Stardate: 46424.1. While performing holodeck maintenance, Barclay accesses the stored hologram of Professor Moriarty, who wreaks havoc on board the Enterprise.