User:SOTO/Forum Archive/The Panopticon/@comment-24070818-20131124143458/@comment-1432718-20131125145526

That might work for Nuwho, but classic Who doesn't have opening credits. There's a lot of inconsistency across those season pages.

Some have just a primary cast, some have primary and secondary, and then there's season 18, which has primary, secondary, recurring, and introducing, or season 8, which has regular and semi-regular. Most of these seem to have been done based on one person's opinion as to who is primary /regular and who isn't.