Below is a nearly a two-minute sneak preview of "An Honest Mistake," Thursday's new episode of Grey's Anatomy. It's a rather intense scene featuring Derek and Addison in mid-surgery.

In the midst of an operation, Derek finds his confidence shaken like never before as he faces off with his former wife and surgical counterpart over what course is best for the patient ...

[video url="http://www.greysanatomyinsider.com/videos/an-honest-mistake-sneak-preview/" title="An Honest Mistake Sneak Preview"] [/video]

Looks like another terrific installment of the Grey's-Private Practice crossover. Follow the link for two more promos for Thursday and all the latest news and Grey's Anatomy spoilers!

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