Kristen Johnston Kristen Johnston

OK, a real alien isn't invading ER, just someone who played an alien. Kristen Johnston, who won two Emmys for her role as sextra-terrestrial Sally Solomon on 3rd Rock from the Sun, is returning to NBC this fall in a recurring role on ER, TVGuide.com has learned. Johnston will play Eve Peyton, an inscrutable and unflappable nurse manager who's on a mission to whip the department into shape while mentoring Nurse Sam (Linda Cardellini). She'll first appear on Oct. 6.