Cooper and Charlotte take Erica to Seattle Grace to meet with Derek, Lexie and Amelia regarding a very risky surgery; Scott tells Violet that he would like to take their relationship to the next level; and Addison finds herself caught in the middle of Sam and Jake's fight about a patient. Meanwhile, Sheldon warns Sam to be cautious as he deals with the return of his sister, Corinne.
Elenco: Kate Walsh , Benjamin Bratt , Paul Adelstein , KaDee Strickland , Caterina Scorsone , Matt Long , Taye Diggs , Amy Brenneman , Griffin Gluck , Brian Benben , Stephen Amell .