Doctor Who: Flux perfectly demonstrates how The Doctor's habit of leaving companions is ingrained into the character's history — even the bits she can't remember. Everyone knows the hazards of becoming The Doctor's companion.
You will be shot at by grotesque aggressors. You shall get frequently patronized by an alien with questionable fashion sense.
And most importantly of all, there's a strong chance of being dumped and forgotten when the partnership comes to an end. Some companions are
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