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Owen Hunt During a hospital shooting, Owen is shot and injured, attracting the sympathy of Cristina, who subsequently restores their relationship.[7] Due to the emotional reverberations of the shooting crisis, Owen and Cristina decide to wed one another shortly after their reconciliation, not wanting to risk separation.[8] When Cristina discovers she is pregnant, Owen is displeased with her desire to abort the baby, and the two separate from each other.[9] In the fallout of resident Meredith Grey (Ellen Pompeo)'s tampering with Derek Shepherd's Alzheimer's trial, Owen is promoted to Chief of Surgery after Webber steps down.[10] After substantial thought, Owen reluctantly decides to accompany Cristina to the abortion, uniting the two.[11] Owen's friendship with Teddy ends when Owen lies to Teddy about her husband's sudden death, due to Owen wanting her to finish a surgery she was currently performing and Teddy blaming Owen for her husband's death.[12][13] Feeling abandoned and disconcerted after an altercation with Cristina, Owen has a one-night stand with a patient's friend.[14] Cristina consequently finds out, terminates their relationship, and their marriage is tested. After Cristina passed her medical boards, she reconciles with Owen, but reveals to him that she is leaving Seattle to go to Mayo Clinic.[15] Teddy and Owen eventually became friends again. She had been offered a position at the United States Army Medical Command but chose to stay at Seattle Grace Mercy West out of loyalty. After Teddy's husband Henry dies she wallows in her grief and it affects her colleagues and residents, causing Owen to "fire" her so that she can have a fresh start elsewhere.[16] He also fires April Kepner (Sarah Drew) because the hospital cannot afford to keep her due to her not being a Board certified.[16] Months later, Hunt visits Kepner and rehires her as he realized he made a mistake.
Cristina Yang During her internship, Cristina has an on-off relationship with the chief of cardiothoracic surgery Preston Burke (Isaiah Washington) that leads to an accidental pregnancy. Yang schedules an abortion without telling him about the pregnancy due to Burke's behavior towards their lack of relationship status. However, Yang experiences an ectopic pregnancy and Burke discovers the pregnancy after Yang collapses from a burst fallopian tube. Burke and Yang begin a relationship in the aftermath of her miscarriage. After Burke is shot in the arm and develops a hand tremor, Yang helps him cover it up by developing a covert partnership wherein she performs most of his surgeries. Yang initially denies involvement during a confrontation, but then confesses everything to Richard Webber (James Pickens, Jr.), the chief of surgery. Yang's actions jeopardize Burke's chances of becoming chief, which he sees as a huge betrayal. After a short breakup, Yang breaks the silence and Burke proposes marriage, which Yang accepts after eight days of hesitation. Burke calls off the wedding, leaving Yang at the altar. She goes on her honeymoon to Hawaii with Meredith to recover, returning to discover that Burke has disappeared from her life and transferred to a different hospital.