Board Thread:The Panopticon/@comment-9435571-20140927221308/@comment-188432-20140928072336

While there are no in-universe definitions of a companion, it would be chaotic in the extreme if we as a wiki started calling any person who travelled in the TARDIS a companion. There are hundreds of characters who have done this. Let's hold off on making any determination about Courtney until the end of the series, at least.