It's a decision that could change Grey's Anatomy forever... and spawn another hit show. But do we want it to?

When Thursday's two-hour episode, "The Other Side of This Life (Parts I & II)," hits the airwaves, the focal point will be Addison, who is currently considering a change of scenery.

A permanent change of scenery.

We're told that Addison talks with her god-daughter and her friends from medical school, and that she lands a job offer outside of Seattle. Many interesting people guest star in the course of Dr. Montgomery's road trip to Los Angeles, leading us to wonder if Addison (Kate Walsh) will return... or whether Private Practice will be officially born.

As for the former men in her life, Derek has to perform emergency surgery and Mark treats a patient who wants more than surgery. Preston has a reservation about marrying Cristina, and he turns to someone unlikely for advice on the matter. The doctors also treat a woman with a rare type of cancer, and whose daughter doesn't believe people make mistakes.

Here's a preview of "The Other Side of This Life" ...

[youtube]http://www.youtube.com/watch?v=q_wwn5kQF7s[/youtube]

As usual, we'll have our comprehensive episode recap, music guide, list of quotes and image gallery up after the show. We're looking forward to this event and will be watching right along with you. Follow this link for our episode guide, quotes and more from last week's "Desire."

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