Grey's Anatomy star Kevin McKidd steps behind the camera this week to direct an episode, which he says is "one of the scariest things I've ever done in my life."

Thursday's episode will include the launch of Derek's Alzheimer's clinical trial, Bailey tweeting from the operating room, and the beginning of parenthood for Mark, Callie and Arizona. How did his directorial debut go over? McKidd dishes:

Kevin McKidd reveals songs from the Grey's musical episode

Worst (Exhausted) Direction: "There were a couple moments where I had to...

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