Grey's Anatomy Season 4 Episode 13
Piece of My Heart
Addison visits Seattle Grace because they need skills that only she has. Rebecca/Ava returns with news for Alex. Meredith and Derek's clinical trial experiences one or two developments.
Guest Stars
Kate Walsh
Addison Montgomery
Brooke Smith
Erica Hahn
Clea DuVall
Jennifer Robinson
Gloria Garayua
Intern Graciella
Amy Madigan
Katharine Wyatt