Will Hawkes

April's visiting sisters get on her nerves; when Matthew and Jackson witness an accident, they must work together; Callie and Arizona work on their relationship.

The gang are invited to a wedding of a mutual friend. Nick is worried that he'll run into Caroline, his ex, and so asks Jess to be his pretend girlfriend. Meanwhile, Schmidt is on the prowl for single women but ends up with his sexual arch-enemy and Winston relishes his role as usher by getting competitive on the dance-floor.