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1977 • 24 Episodes
Season 1 of In Search of... premiered on April 17, 1977
Leonard Nimoy hosts investigations into various mysteries.
Season 2 of In Search of... premiered on December 24, 1977
1978 • 24 Episodes
Season 3 of In Search of... premiered on September 14, 1978
1979 • 24 Episodes
Season 4 of In Search of... premiered on September 20, 1979
1980 • 24 Episodes
Season 5 of In Search of... premiered on September 20, 1980
1981 • 24 Episodes
Season 6 of In Search of... premiered on September 21, 1981
2002 • 8 Episodes
Season 7 of In Search of... premiered on October 4, 2002