The series is cancelled at the end of the twenty sixth season. Some time after, a new player joins the group. Deciding that everyone is getting a bit too old to still be playing teenage girls, she decides...
Sorry, what? You were expecting Grace Holloway, or Rose, or somebody? You're wondering who the heck I'm on about? Ah, right. Well, in that case, I suppose I'd better explain. (And if you weren't wondering anything of the sort - and many of you probably weren't - you can skip the next four paragraphs).
The classic series of Doctor Who was cancelled in December, 1989. For the first time in over a quarter of a century, there were no new DW stories coming out, and no prospect of any more soon, if ever. On television, at least. Because, of course, this left the door open to what I've been referring to in these posts as the "spin-off media", as the only venue for new material. Well, there's Dimensions in Time, too, if you're not trying to block that from your memory, but why wouldn't you?