Grey's Anatomy Season 4, Episode 17 : Freedom (2)

A couple undergoes surgery. Derek and Meredith's clinical trial gets a second shot from a new patient. Izzie helps Alex. McSteamy hooks up with someone. Guest Stars: Brooke Smith, Jurnee Smollett, Loretta Devine, Amy Madigan, Lauren Stamile, Sterling Knight, Elizabeth Reaser, John Cothran, James Immekus, Kathryn Meisle, Jana Kramer, Stephen Bishop, Christian Alexander, Jerry Zatarain Jr.,

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