Out Of Mind, Out Of Sight - S1-E11
Question: At the end of the episode, the invisible girl is taken away by government officials and put in a school where other invisible children are taught things such as assassination and infiltration. Did the series ever follow up on this 'loose end'?
Answer: Marcie Ross - the invisible girl - is never heard of again, though in Season Seven there is another girl who starts turning invisible before Buffy steps in and acknowledges her. That said, in Season 8 (comic) there's hints that Marcie might possibly make a guest appearance in Season 9, as she is asked for by numerous fans.
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