Johnny is stuck having to go to the library to find a book for a book report. But he hates being there, because he's convinced the librarian... IS EVIL! And it turns out, he was right! Using a blaster ray of her own making, she removes Johnny's voice, effectively silencing him. Johnny, using gestures and motions, convinces Susan & Mary to help him and Dukey stop her, but after finding her secret villain lair, the librarian silences them all! // When Johnny finds out he will have to go to summer school if he fails another test, he turns to his genius sisters to enhance his brain. Susan & Mary, along with Dukey, shrink down to microscopic size and pilot an experimental submarine in to Johnny's brain in order to make him smarter. But something goes wrong, and Johnny transforms in to the evil, test hating supervillain, JOHNNY DETEST!