Winston Story

Meredith, Cristina, Izzie and Alex spend their first day as residents with their own interns, including George, repeating his internship after failing his exams, and Meredith's half-sister. Cristina searches for Burke, who is nowhere to be found and Richard resumes his position as chief of surgery.

The new interns are dazzled by the skill level of fellow intern George, while Lexie helps keep his "repeater" status a secret; Meredith half-heartedly helps Lexie with her first emergency patient.

Addison (Kate Walsh) returns to Seattle Grace to perform a surgery and is surprised to learn about the changes in her former coworkers' lives.

The hospital has a pipe break which causes a huge flood; Meredith quits therapy but Dr. Wyatt doesn't believe she is finished.

Frankie & Brick discover a death in the house – 50 years ago.

A group of college students are rushed to Seattle Grace following a serious car crash on their way to the graduation ceremonies; Izzie continues feeling similar symptoms.