Season 9, Episode 24: "Perfect Storm"
There's no plane crashes in the ninth season finale of Grey's Anatomy, but Meredith does go into labor during a power outage and has internal bleeding right after giving birth. While "Perfect Storm" might have some of Meredith's biggest moments, Oh delivers a solid performance here. It's a big day for her character. Cristina gets to perform a thrilling surgery in the dark and see her friend survive a dangerous procedure. But in the end, she also has to resolve her relationship with Owen, who wants a child when she doesn't.