Z’oh my heavens, Mr. Crawley! Terms of Endearment star Shirley MacLaine will be joining the cast of Downton Abbey, which has replaced This Old House and Ken Burns documentaries as PBS’ must-see TV.
Ms. Maclaine will be playing the proud American mom to ex-pat Lady Cora (Elizabeth McGovern) on season 3. (This visit will not go over well with Dame Maggie Smith’s Lady Grantham, we’re sure.)
This news was accompanied by rumors that other stateside cameos might be in the works, so we made several educated guesses as to which American actors could hold their own against the upstairs/downstairs scheming of the McGovern household.
Click through to see our choices, and right in your own candidates in the comments!
(With help Andrew Belonsky.)

I too am addicted to the show! The best full hour on television!
Oh God Shirley MacLaine does she come over on the Mauretania or by alien spaceship. Can’t see anything good coming out of this. As ridiculous as Friends was with the old TV sitcom stars “guest staring”. Blake Lively guest staring as anything would be nice.