Grey's Anatomy/Fear (of the Unknown)
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Fear (of the Unknown) is the twenty-fourth episode of the tenth season of Grey's Anatomy, and the two hundred and twentieth episode overall.
Starring: Ellen Pompeo (Meredith), Sandra Oh (Cristina), Justin Chambers (Alex), Chandra Wilson (Miranda), James Pickens, Jr. (Richard), Sara Ramirez (Callie), Kevin McKidd (Owen), Jessica Capshaw (Arizona), Sarah Drew (April), Jesse Williams (Jackson), Camilla Luddington (Jo), Gaius Charles (Shane), Jerrika Hinton (Stephanie), Tessa Ferrer (Leah), Patrick Dempsey (Derek)
Guest Starring: (in credits order) Debbie Allen (Dr. Catherine Avery), Caterina Scorsone (Dr. Amelia Shepherd), Jason George (Dr. Ben Warren), Rick Worthy (Ray Phillips), Rebecca Field (Sabine McNeil), Kelly McCreary (Dr. Maggie Pierce)
Co-Starring: Micah Cohen (Glen), Autumn Lee Withers (Marilyn) Kunal Kumar (Mike), Nichole Bloom (Leanne), Thomas Barbusca (Link McNeil), Teresa Huang (Nurse Ruth), Nicole Cummins (Paramedic Nicole), Nadine Griffith (ER Nurse), Michelle Alegria (Morning Anchor), JJ Snyder (Reporter), Matthew Bohrer (Male Reporter), Graham Clarke (Weather Guy), Seril James (Doctor), Elena Schuber (Baby's Mom), Sean C. Graham (Baby's Dad), Ed Ackerman (Eyeball Man), M.Q. Tran (Young Girl)
Cristina must head to Zurich soon, but she is unprepared to leave behind her life in Seattle. Fear runs amok throughout the hospital as an explosion in a shopping mall results in a mass casualty situation.