Board Thread:The Panopticon/@comment-1293767-20151029072618/@comment-27501528-20160108212052

Oh, I thought Hell Bent was wonderful. But we'll save that conversation for another day... I think "we might just be encountering a very different two-parter here" hits the nail on the head. The guest star rule is only broken because the first part has no guest stars - the Veil and the boy don't speak, and the boy isn't credited, so I'd say he barely qualifies as a role (I had a look through and couldn't find him in Hell Bent, by the way, though he could be somewhere in one of the group shots. I think that would be a pretty tenuous classification.) I think you could argue on that basis that the story passes your three-rule system.