 Boone Carlyle (Ian Somerhalder) returned for the fifth time since his death late in the first season.Furthermore, Ethan (William Mapother) and Dr. Arzt (Daniel Roebuck) reprised their guest roles in flashbacks.The episode got a mixed response from critics and fans, with positive reception considering it an entertaining send-off to two unpopular characters, but negative reviews deeming it unnecessary.