1980 | 18 Episodes

Season 1 of Magnum, P.I. premiered on December 10, 1980.

1981 | 22 Episodes

Season 2 of Magnum, P.I. premiered on October 7, 1981.

1982 | 23 Episodes

Season 3 of Magnum, P.I. premiered on September 29, 1982.

1983 | 21 Episodes

Season 4 of Magnum, P.I. premiered on September 28, 1983.

1984 | 22 Episodes

Season 5 of Magnum, P.I. premiered on September 26, 1984.

1985 | 21 Episodes

Season 6 of Magnum, P.I. premiered on September 25, 1985.

1986 | 22 Episodes

Season 7 of Magnum, P.I. premiered on September 30, 1986.

1987 | 13 Episodes

Season 8 of Magnum, P.I. premiered on October 6, 1987.