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Meredith gets upset when Derek finds her mother’s diary; Callie worries about her first “official” date with Erica; and Cristina discovers a part of the hospital that neither she nor her fellow residents had seen before.

A plumbing leak becomes a deluge and wreaks havoc at Seattle Grace, as the Chief attempts to implement new teaching policies and George tries to retake his residency exam. Meanwhile Derek hopes to make some changes at Meredith’s house.

A new Doctor comes to Seattle Grace.