Jason O'Mara

Meredith, Alex, Izzie and Cristina compete in a surgical contest, with Bailey judging; George and his new roommate, Lexie, adjust to their squalid apartment; and Callie finds a friend in Erica Hahn. The episode takes place six weeks after Derek and Meredit (more…)Meredith, Alex, Izzie and Cristina compete in a surgical contest, with Bailey judging; George and his new roommate, Lexie, adjust to their squalid apartment; and Callie finds a friend in Erica Hahn. The episode takes place six weeks after Derek and Meredith ended their relationship and Derek began dating Rose (Lauren Stamile). Dr. Wyatt: Amy Madigan. Otis: Cheech Marin.

Addison (Kate Walsh) returns to Seattle Grace to perform a surgery and is surprised at the changes in her former coworkers' lives; Meredith and Derek's clinical trial has its first patient; Ava/Rebecca (Elizabeth Reaser) returns with news for Alex. Dr. Wya (more…)Addison (Kate Walsh) returns to Seattle Grace to perform a surgery and is surprised at the changes in her former coworkers' lives; Meredith and Derek's clinical trial has its first patient; Ava/Rebecca (Elizabeth Reaser) returns with news for Alex. Dr. Wyatt: Amy Madigan.

Part 1 of 3. Sam Adams is pursued by British authorities; riots break out in Boston.