Grey's Anatomy Mega Buzz: What Brings Leah Back to Grey Sloan?

Leah Murphy (Tessa Ferrer) makes her much-anticipated return to Grey Sloan on this week's episode of Grey's Anatomy, and to say her former colleagues are surprised by her arrival would be an understatement.

Remember, Murphy was fired for gross incompetence and filed a sexual harassment claim against Callie (Sara Ramirez).