Catherine Avery returns to Seattle Grace to help the doctors with an extra large surgery.
Aware that Derek might never operate again, Meredith stops talking about the surgeries she's performing.
Meanwhile, Richard calls on Dr. Catherine Avery to help him perform a complicated procedure, as things continue to heat up between Jackson and April.
Arizona's struggle to accept her fate forces Callie and Alex to face their guilt.
Written by Austin Guzman
Directed by Kevin McKidd