One week after the departure of Erica Hahn (Brooke Smith) from Grey's Anatomy, new face Sadie (Melissa George) arrives to shake things up in Seattle tonight at 9 p.m.

Also, this week's episode, "These Ties That Bind," marks the first for Owen Hunt (Kevin McKidd) as a full-time character. Now that's positive news everyone can agree on!

Another terrific guest star, Mary McDonnell, makes her debut tonight as Dr. Dixon. As one fan put it, she's the biggest thing to happen to the show since ... Kevin McKidd!

For a preview of what transpires tonight, check out our gallery of photos, as well as the videos we've assembled from the episode so far. More to come after the episode airs.

As always, you can discuss it before, during and after the show in our

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.