Sean Pertwee decided to cosplay as his Dad for Halloween. Odds are, if you cosplayed your father it would involve putting a little more grey in your hair and walking around complaining why your kids never call.
In this case however, Sean Pertwee’s Dad happens to be Jon Pertwee—the Third Doctor. He’s never had aspirations to take on the role himself, but he looks simply perfect in this picture. He might not be the Third Doctor, but he’s still a Time Lord by birth.