Alex, Julie, Jack and Katie Power are super-hero siblings determined to do their part to protect the world despite their young age. The problem is that their parents don't want them to have powers - and can't know that they do. But when their friend Franklin Richards has a premonition of a galactic threat hurtling their way, the Power siblings will have to decide what kind of heroes they want to be - and what they're willing to give up along the way.
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