` ::::IMHO the first line of this article is wrong, and I've been meaning to propose a change for some time. The better and referenced section Companion (Doctor Who)#Definition starts with ``There is no formal definition of what makes a companion.`` Therefore saying someone is a companion because ... doesn't work. The recent companions on this list all have a reliable sources (except Amy, but there's ref 5 on her page). No the BBC is not the only reliable source.   `