Watch a sneak peek of GREY'S ANATOMY Season 5 Episode 21 "Sweet Surrender"

As preparations continue for Meredith and Derek's wedding, Izzie receives a surprise hospital visit from her handful-of-a-mother, Robbie. Meanwhile, a newly sober Thatcher visits his daughters, Meredith and Lexie, in order to make amends, and the Chief and Meredith bitterly fight over a controversial medical case, on "Grey's Anatomy," THURSDAY, APRIL 30 (9:00-10:02 p.m., ET) on the ABC Television Network.

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