Payton Silver

Owen organizes a baseball game against Seattle Presbyterian; Lexie is unable to control her emotions when she sees Mark with a new woman; Alex fights for Zola; Richard talks to Meredith and Bailey about their feud.

Derek and the attendings go out to celebrate when he gets the grant he needs for his clinical trial; Meredith and Alex must fend for themselves during the night shift.

The doctors form two teams to operate on conjoined twins; Bailey uses Meredith as a buffer between her and Ben; Alex learns a tough lesson; Teddy asks Cristina about Henry's surgery.

Meredith feels left out when Derek breaks ground on his clinical trial; Bailey's new idea does not go over well with the chief; Callie irritates her new obstetrician (Rachel Taylor).

A cataclysmic event leaves the doctors shaken; Callie, on the verge of a life-changing moment, starts imagining about the hospital and her friends.

Derek asks Meredith to work with him in neuro again; Catherine Avery (Debbie Allen) comes back to Seattle Grace and takes an interest in Richard; Cristina becomes increasingly suspicious of Owen; Morgan may be falling for Alex.