Kate, who plays Dr. Addison Montgomery, is heading back to Seattle Grace yet again in January, ABC confirmed to Access Hollywood.

Kim, who just completed her first few days on the "Grey's Anatomy" set in Los Angeles, explained that Teddy's past is intertwined with Kevin McKidd's character, Dr. Owen Hunt.

LOS ANGELES, Calif. -- In May, audiences were first given a glimpse of FOX's "Glee," when the network aired the pilot after the finale of "American Idol," forcing fans to wait until the show's return in fall for more. In addition to a stellar ensemble cast, hilarious writing and amazing pop songs re-imagined by a misfit high school choir, the series introduced a breakout star in the form of chanteuse Lea Michele.

And while fans may be up in arms over George O'Malley's impending absence from Seattle Grace, Knight is very comfortable with his decision to walk away from the show after five seasons.

Melissa made her Seattle Grace debut on Thursday as Sadie, a friend from Meredith Grey's past who happens to show up at her door after landing an intern job at the hospital.

And if Thursday's episode is any indication, Sadie won't be a character just lurking in the background.

The hit ABC show has parted ways with actress Brooke Smith, who plays the ever-outspoken Hahn, Access Hollywood has confirmed.

How did show creator Shonda Rhimes explain the decision to Access?