John Ritter as Jack Tripper (Seasons 1–8)
“Primary characters”
Joyce DeWitt as Janet Wood (Seasons 1–8)
Suzanne Sommers as Chrissy Snow (Seasons 1–5)
Jenilee Harrison as Cindy Snow (Seasons 5–6)
Priscilla Barnes as Terri Alden (Seasons 6–8)
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