This week's episode of Grey's Anatomy features a character we haven't seen much of lately: Derek. McDreamy has been in every episode this season, but rarely front and center.

That's about to change as he fights to save the hospital's own lab technician, Isaac, from an inoperable tumor surrounding his spine. All the while, he battles Richard's authority.

"Give Peace a Chance" also marks the directorial debut of Chandra Wilson (Dr. Miranda Bailey), who steps behind as well as in front of the Grey's Anatomy camera this week.

Click to enlarge photos from this Grey's Anatomy episode ...

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