Question: what episode of grey's anatomy does nurse olivia come back?
Answer: The season's only notable appearance by a nurse character came in episode 21, when Nurse Olivia returned from the show's early seasons to haunt attending Alex Karev. Longtime fans will recall that in season 2 episodes 11 and 12, airing in 2005, then-intern Alex had sex with the wide-eyed Olivia and gave her syphilis.