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Bubble Baby is the superhero identity of Molly's little sister, Mia, and the sidekick to both her big sister's superhero identity Guppy Girl and Bubble Boy.


When Miss Goo-Goo attempted to turn everyone in Big Bubble City into babies and take over afterwards, Bubble Boy and Guppy Girl arrived on the scene to stop her. However, Bubble Boy was turned into a baby, forcing Guppy Girl to fight Miss Goo-Goo alone, until her little sister Mia changed to her superhero identity of Bubble Baby and flew off to help her big sister save the day.


  • Deema is the only person in Big Bubble City to actually know that Mayor Molly and Guppy Girl, and Mia and Bubble Baby, are both one in the same.