Grey's to Shed Light on Main Character's Past

According to TV Guide’s Mega Minute, Shonda and Co. have plans to introduce a character from one of the core cast’s past in order to make their background a little less murky. To find out who TV Guide has narrowed it down to, check out the following video.

Which of the characters on Grey’s would you like to know more about? I’d vote for Alex. He’s entirely mysterious. I’d love to know more about him.