7. The Ropers (ABC)
If our beloved Helen (Audra Lindley) and Stanley (Norman Fell) never left Three's Company, we wouldn't have gotten Mr. Furley (Don Knotts). So we'll just have to accept this Company spinoff, and be thankful that when the Ropers moved to a condo, they had a neighbor played by Jeffrey Tambor. This first season's six episodes faired well, but the show fell out of the Top 30 the following (and final) season.
Seasons on DVD: None