Grey's Anatomy [1] will welcome two new characters this week, just a week after the sudden departure of Brooke Smith's Dr. Hahn [2]. We've already heard a bit about the two, Sadie and Dr. Virgina Dixon [3], but this is the first time we'll get to look at them walking the halls of Seattle Grace.

By the way, Kevin McKidd's Dr. Owen Hunt was officially made a regular character [4] — like there was any doubt! — so we'll have him around to treat wounds and complain about the residents' attitudes for a while longer. Will either Melissa George's Sadie or Mary McDonnell's Virginia end up on the show full-time? To watch clips of each actress talking about her character and interacting with the rest of the Grey's gang, .

Photos courtesy of ABC, Inc. [7]