Richard Kline as Larry Dallas (Seasons 2–8)
“Secondary characters”
Norman Fell as Stanley Roper (Seasons 1–3)
Audra Lindley as Helen Roper (Seasons 1–3)
Don Knotts as Ralph Furley (Seasons 4–8)
Ann Wedgeworth as Lana Shields (Season 4)
These quotes come from Wikiquote's Three's Company pages and are available under the Creative Commons Attribution-ShareAlike License.