"Grey's Anatomy" Spoilers #4.07 "Physical Attraction...Chemical Reaction"
Jeff Perry returns as Meredith's and Lexie's father Thatcher Grey and "Prison Break's" Rockmond Dunbar ("C-Note") guest stars on the November 8 episode of "Grey's Anatomy" titled "Physical Attraction... Chemical Reaction."
George (T.R. knight) and Izzie's (Katherine Heigl) romantic chemistry is put to the test, as Derek (Patrick Dempsey) asks for more than a physical connection from Meredith (Ellen Pompeo).
Much to his own surprise, Mark (Eric Dane) develops a crush on a fellow surgeon.
Callie's (Sara Ramirez) role as Chief Resident is placed in jeopardy after she delegates much of her job to Bailey (Chandra Wilson).