The unassuming 12-year-old Sue has physical contact with a secret serum her mother has developed for the good of humankind – and suddenly she is able to make herself invisible. Teaming up with her two dissimilar sidekicks App and Tobi, as well as the precocious A.I. (artificial intelligence) Alfred, Sue has to undergo lots of dangerous adventures with her new superhero powers so as to free her mother from the clutches of dark forces – and ultimately prove herself on her own abilities as a superhero.