EW is reporting that AHS veteran Lily Rabe will reprise her role as Sister Mary Eunice from Season 2’s Asylum. Her appearance will intersect with Pepper’s backstory and how she ends up in Briarcliff. She will be seen in the 10th episode winter cliffhanger.
Also joining the Freakshow are Neil Patrick Harris and husband David Burtka, who will appear separately.
See the complete article here:http://insidetv.ew.com/2014/10/29/ahs-freak-show-lily-rabe/