Below is a photo gallery for Thursday's all-new episode of Grey's Anatomy, "These Ties That Bind." Meredith's old friend Sadie arrives and makes her presence felt early.

Meanwhile, Lexie leads her fellow interns in secretive, unorthodox surgical training sessions; and a new surgeon, Virginia Dixon, brings some law and order to the OR.

Click to enlarge any of the pics below, with many more after the jump!

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