<Tr> <Th> 42 </Th> <Td> 6 </Td> <Td> "Let the Angels Commit" </Td> <Td> Jessica Yu </Td> <Td> Stacy McKee </Td> <Td> November 2, 2006 (2006 - 11 - 02) </Td> <Td> 21.02 </Td> </Tr> <Tr> <Td_colspan="7"> Cristina scrubs in on the rare "humpty dumpty" surgery, much to the envy of her fellow doctors . Bailey wants to scrub in and writes her name on the surgical board as the resident in charge . Cristina erases Bailey's name in order to cover for Burke's hand tremor, which leads Bailey to believe that he was the one responsible for the deletion, leading her to question her talent for surgery and becoming discouraged . Derek receives a surprise visit from his sister and learns that she had slept with Mark, something that threatens their fragile friendship . George and Addison work with a pregnant woman with an unusual dilemma . Mark takes Alex off plastics after he chooses Addison's patient over being on hold at the DMV for Mark, but he later witnesses Mark and Callie discussing their one - night stand . Izzie returns to work, but is on probation and is not allowed to talk to patients, perform any surgery, or even go into an operating room . Bailey directs Meredith to be Izzie's boss for the day and the two treat a patient that may need to be admitted into psychiatry . At the end of the episode, Bailey witnesses Cristina reorganizing the operations board, and becomes suspicious . </Td> </Tr> <Tr> <Th> 43 </Th> <Td> 7 </Td> <Td> "Where the Boys Are" </Td> <Td> Daniel Minahan </Td> <Td> Mark Wilding </Td> <Td> November 9, 2006 (2006 - 11 - 09) </Td> <Td> 20.65 </Td> </Tr> <Tr> <Td_colspan="7"> Derek invites Burke to join him on a quiet camping trip, but George, Alex, Webber, Joe and Walter come along, ruining Derek's plans . George notices Burke's hand tremor whilst fishing with him, but Burke brushes off George's concerns . Addison and Callie team up to work on a patient but realize that their passion for medicine is not the only thing they share, as they had both slept with Mark and later regretted it . Alex tells George that Callie slept with Mark, and he is unable to accept the truth, even though he and Callie were broken up at the time . Things go from bad to worse when George and Alex fight, and Walter gets injured in the process . Meredith assists Mark on a sex - change procedure as he keeps trying to get her to sleep with him, but complications arise when it's discovered that the patient has breast cancer . Bailey confronts Cristina after realizing that she was the one to erase Bailey's name off the surgery board, not Burke, and finally regains confidence in her abilities as a surgeon . As a result, Bailey takes revenge on Cristina by assigning her to the case of a child who swallowed 21 Monopoly pieces, and keeps her off surgeries until she admits why she took Bailey's name off the board . Izzie has to have a counselling session with Sydney, the perky resident who annoyed the interns when Bailey was on maternity leave . </Td> </Tr>

Who becomes chief of surgery on grey's anatomy season 3