- Alan Thicke as Dr. Jason Roland Seaver
- Joanna Kerns as Margaret Katherine “Maggie” Malone (she kept her maiden name, although at some points she did refer to herself as Maggie Seaver)
- Kirk Cameron as Michael Aaron “Mike” Seaver
- Tracey Gold as Carol Anne Seaver (1985–1992) (Replaced Elizabeth Ward after the pilot was shown to test audiences with poor results.)
- Jeremy Miller as Benjamin Hubert Horatio Humphrey “Ben” Seaver
- Ashley Johnson as Christine Ellen “Chrissy” Seaver (1990–1992)
- Leonardo DiCaprio as Luke Brower Seaver (later became Seaver after they adopt him). (1991–1992)
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