This is one of the Doctors oldest companions. But when her genetically advanced son gets kidnapped. She sets off with the Doctor again. But when she is kidnapped by the MASTER. Could the Doctor just forget them like that?
Now here's a mystery. Juliette knows the Doctor in the future and has also travelled with him. But when she leaves for the final time, what is it that she gives to the Doctor? And will she be back in the future? Who knows.