User blog comment:TheDoctor230/Title Cards/@comment-9346948-20171114053613/@comment-3221148-20171114210655

With Khufu, there was a mix up over his actor being in the main cast or not. Technically, he is "main cast" for one episode, and special appearance for the rest, even though that seems contradictory.

Same with the actress who plays Liv Aberdine in Constantine.