Which Oscar Winner Should Guest Star on 'Downton Abbey' ?

Shirley MacLaine came – and just as quickly went – on Downton Abbey this season, but her breezy cameo got us thinking.

Now that the Terms of Endearment Oscar winner has broken down the barrier, who among Academy Award winners and nominees should next make a guest appearance on the popular PBS series?

And just what sort of character should he or she play? Upstairs or down?

Here, then, are some recent Oscar-caliber actors who might suitably fit the bill. Please be so kind as to select your favorite. (And, in the comments section, do cast them in suitable roles.) Ta.