It would be a fairly glorious way to go, though, if it left a generation of children inoculated against such a jealously-guarded mascot.

(And of course the Seventh Doctor did take a pop at McDonalds, too, in Ghost Light. But it was just a sideswipe, not a full-blown parody).

I'm trying to think, now. Has the Whoniverse done 'Happy smiling corporate mascot is really the monster'? The closest I can get at the moment is the Ood in Planet of the Ood, except that the real monsters there are the humans. Or Max Capricorn in Voyage of the Damned, perhaps.