"I Will Follow You into the Dark" - After learning at a deposition that more of his patients have died than survived, Derek decides to quit, even as Meredith refuses to give up on him. Meanwhile Bailey and the Chief continue to bicker over her peds fellowship -- until Adele steps in to mediate -- and Izzie's interns discover something unsettling on a "patient x," unaware that the charts they're looking at are actually Izzie's, on "Grey's Anatomy," THURSDAY, MARCH 12 (9:00-10:02 p.m., ET) on the ABC Television Network.

"Stand By Me" - After his fellow surgeons try and fail to bring Derek back to work, Meredith must summon the strength to convince him. Meanwhile the hospital is abuzz as Mark attempts a rare face transplant surgery, Cristina, at last awarded her first solo surgery, is more focused on the needs of her friends, and Izzie does her best to keep her medical condition a secret, on "Grey's Anatomy," THURSDAY, MARCH 19 (9:00-10:02 p.m., ET) on the ABC Television Network