The Twin Supervillains are a pair of identical eleven-year-old twin sisters named Molly and Polly, who are known as 'Sneaky Swimmer' and 'Frightening Fairy' respectively. Molly's costume consists of a black long-sleeved full-body rubber wetsuit, a pair of black swimming goggles, a pair of black rubber gloves, a pair of black flippers, a black swimming cap with a red bandanna tied around it, a pair of black nose-clips, a black scuba breather and a black mask hiding her face except her eyes. Polly's costume consists of a purple long-sleeved full-body rubber jumpsuit covered in sparkles with an evil grinning face in the center, a pair of pink swimming goggles, a pair of dark purple rubber gloves, a pair of dark pink rubber boots with yellow lightning bolts on them, a pair of purple fairy wings, an indigo tutu, a pink sparkly domino mask and a pink utility belt. Molly has the power to breathe underwater, swim really fast and camouflage herself on both land and water, while Polly has the power to make scary monsters appear with her wand. Both twins have one goal: to take over and rule the world together.