Grey's Anatomy/Physical Attraction... Chemical Reaction
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Physical Attraction... Chemical Reaction is the seventh episode of the fourth season of Grey's Anatomy, and the sixty-eighth episode overall.
Starring: Ellen Pompeo (Meredith), Sandra Oh (Cristina), Katherine Heigl (Izzie), Justin Chambers (Alex), T.R. Knight (George), Chandra Wilson (Miranda), James Pickens, Jr. (Richard), Sara Ramirez (Callie), Eric Dane (Mark), Chyler Leigh (Lexie), Brooke Smith (Erica), Patrick Dempsey (Derek)
Guest Starring: (in credits order) Jeff Perry (Thatcher Grey), Rockmond Dunbar (Sean Brotherton), Stephanie March (Jane), Vicki Lewis (Harriet), David Burke (Don), Kurt Fuller (Jerry), Enuka Okuma (Teresa Brotherton), Braeden Lemasters (Brian), Mark Saul (Intern Steve), Amrapali Ambegaokar (Intern Dani), Linda Eve Miller (E.R. Nurse)