Video ClipsSee all »
Watch See all »
Meredith feels left out as Derek begins work on his Alzheimer's clinical trial; Callie drives her obstetrician (Rachael Taylor) nuts as she, Mark and Arizona try to come to grips with her pregnancy; and the chief is not happy with Bailey's OR tweets.
Meredith gets to run the ER for a night, and it's quite a learning experience. She and everyone else are also surprised when Adele Webber (Loretta Divine) shows up as a patient. Meanwhile, Bailey and Eli (Daniel Sunjata) sneak off for some mischief.
Meredith discovers that her fertility treatments are causing problems with her eyesight; Mark tells Callie and Arizona in no uncertain terms that he intends to be an active dad; and April sees a side of Dr. Stark (Peter MacNicol) she wasn't expecting.