1977 | 13 Episodes
Season 1 of The Professionals premiered on December 30, 1977.
1978 | 10 Episodes
Season 2 of The Professionals premiered on October 7, 1978.
1979 | 8 Episodes
Season 3 of The Professionals premiered on October 27, 1979.
1980 | 15 Episodes
Season 4 of The Professionals premiered on September 7, 1980.
1982 | 11 Episodes
Season 5 of The Professionals premiered on November 7, 1982.
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