Here comes the bride! It's almost time for Bailey's big day and, of course, she's pretty much on the verge of a nervous breakdown. It's up to the team at Seattle Grace to keep her calm, but that's more than enough of a challenge for even the most highly trained doctors. Meanwhile Derek and his sister Lizzie (we'll always remember you as the voice of Simba's daughter in that Lion King sequel, Neve Campbell) get ready to go under the knife, while Meredith tries to keep excitement about her pregnancy to a minimum.