 Rachel Dratch, longtime comedy partner and fellow "Saturday Night Live" alumna of Fey, was originally cast to portray Jenna.Dratch played the role in the show's original pilot, but in August 2006, Jane Krakowski was announced as Dratch's replacement.Executive producer Lorne Michaels announced that while Dratch would not be playing a series regular, she would appear in various episodes in a different role.