 " Rosemary 's Baby " is the fourth episode of the second season of 30 Rock , and the twenty @-@ fifth episode overall . It was written by Jack Burditt and was directed by Michael Engler . The episode first aired on October 25 , 2007 on the NBC network in the United States . Guest stars in this episode include Elijah Cook , Carrie Fisher , Marcella Roy , Paul Scheer , Megan Blake Stevenson , Jean <unk> and Stuart <unk> . 
