Morrison joins 'Grey's Anatomy'

Actor Matthew Morrison has joined the cast of the ABC medical drama 'Grey's Anatomy' in a season 13 guest role.

Though it is yet unclear what character Morrison is playing, he revealed a major clue in his Instagram story, reported Entertainment Tonight.

"I'm back to filming. I can't say what I'm on yet, but my name is Dr Paul Stadler," Morrison said dressed in a tie and suit with his hair slicked back.

A 'Grey's Anatomy' fan site also shared a video and an on-set photo of Morrison with Justin Chambers, who plays Alex Karev in the show.