Priscilla Barnes
Priscilla Barnes was actually also the replacement for Suzanne Somers on Three’s Company, she took over Jenilee Harrison’s role as the blonde but wasn’t “stupid”, however Barnes was finally the permanent replacement.
The 62 year old has also appeared in A Vacation in Hell, Licence to Kill, Mallrats, The Devil’s Rejects, and Jane the Virgin.
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Marion Ross
From 1974 to 1984, the one and only Marion Ross played Marion Cunningham on Happy Days.
Although she already had an established film and TV career before this role. Ross is also a voice-over actress with works in King of the Hill and SpongeBob SquarePants. At 89, she makes the occasional appearance.