This undated publicity photo provided by PBS shows Shirley MacLaine as Martha Levinson from the TV series, "Downton Abbey." Carnival Films and MASTERPIECE on PBS today announced that six new cast ... more 

This undated publicity photo provided by PBS shows Shirley MacLaine as Martha Levinson from the TV series, "Downton Abbey." Carnival Films and MASTERPIECE on PBS today announced that six new cast names are joining the series plus the return of Shirley MacLaine for next season's finale. The Hollywood star, who reprises her role as Martha Levinson, proved a huge hit with viewers last year. (AP Photo/PBS, Carnival Film & Television Limited 2012 for MASTERPIECE, Nick Briggs) less