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Sanctuary is the twenty-third episode of the sixth season of Grey's Anatomy, and episode one hundred and twenty-five overall.
Starring: Ellen Pompeo (Meredith), Sandra Oh (Cristina), Justin Chambers (Alex), Chandra Wilson (Miranda), James Pickens, Jr. (Richard), Sara Ramirez (Callie), Eric Dane (Mark), Chyler Leigh (Lexie), Kevin McKidd (Owen), Jessica Capshaw (Arizona), Kim Raver (Teddy), Patrick Dempsey (Derek)
Guest Starring: (in credits order) Michael O'Neill (Gary Clark), Tom Irwin (Officer), Robert Baker (Dr. Charles Percy), Sarah Drew (Dr. April Kepner), Jesse Williams (Dr. Jackson Avery), Nora Zehetner (Dr. Reed Adamson), Ryan Devlin (Bill), Mandy Moore (Mary)