I have, very occasionally, imagined a scene - completely impossible in any Doyleist fashion, but endlessly amusing in Watsonian vision, given, you know, time travel - a meet-up of Every. Single. Companion (including those who didn't travel in the TARDIS, but who were The Brig) from television episodes, Big Finish, New Adventures, what-have-you ... all waiting in some unimaginably large banquet hall in the TARDIS's depths - and the Doctor rounding the corner and seeing them. It amuses me. But then again, I'm easily amused.