Ever heard of Diana Muldaur?
http://www.imdb.com/name/nm0611707/
She's another such actress who appeared in numerous American shows over several decades but she's rubbish because she only seems capable of playing the same character (herself?) whatever the role might be. She really spoilt season 2 of Star Trek: The Next Generation for me, and she also appeared as 2 different characters in the original series of ST in the 1960s.
There's loads of them who appear on American tv shows of whom we're unlikely to have heard over here e.g. over there Pauly Shore is referenced as much as anyone yet who over here has heard of him?