
I just wanted to suggest adding a new type of guest for cast who are credited as "also starring." I recently came across this on a show with three seasons, in only one episode in Season 2, there were guests who were credited as "also starring." I did the right thing and added them to the main cast. But the problem with that is that they're not part of the main cast. Again they were credited as "also starring" not "starring" and only appeared in one episode in Season 2 in a show with three seasons. Just a thought.
(The show in question is Henry Danger and the guest cast in question are Kira Kosarin and Jack Griffo.)