Amrapali Ambegaokar

A freak ice storm brings trauma patients to Seattle Grace; Meredith and Derek discover that "happily ever after" isn't easy; a mysterious military doctor catches Cristina's eye.

A plumbing leak becomes a flood, causing chaos at Seattle Grace; the chief tries to implement new teaching policies; George tries to take his residency exam again; Derek hopes to move Meredith's roommates out of her house.

Bailey leads a team of doctors performing a string of surgeries in which each procedure depends on the one that preceded it; Derek gets all the credit for the brain tumor study he did with Meredith; Lexie tries hard to get George to notice her.

George and Izzie test their romantic chemistry; Derek asks for more than a physical connection with Meredith; Mark develops a crush on a fellow surgeon; Callie finds her role as chief resident jeopardized.

Derek finds an old diary of Meredith's mother; Callie anxiously prepares for her first real date with Erica; Cristina stumbles into a part of the hospital that she and the other residents have never seen.

Cristina, back from her honeymoon trip, searches in vain for Burke; Meredith, Cristina, Izzie and Alex spend their first day as residents with their own groups of interns.