One possible plotline could be that Ben, as a girl, has to deal with the different social expectations. For example, his usual rough - and - tumble approach as a boy might not be as accepted in his new female form. He could struggle to be taken seriously when he tries to use his alien powers to save the day. Another plotline might involve his relationships. His friends might react differently to him, some being overly protective while others might be a bit more distant at first. There could also be a story where he has to learn how to handle the physical differences in combat or other situations.