Annie is a nine-year-old blonde-haired girl who loves to swim. Whenever she goes swimming, she always wears a magenta long-sleeved rashie with flowers on it, a pair of pink long-sleeved togs with red hearts on them, a pair of purple swimming goggles, a pair of violet rubber gloves, a blue swimming cap with raindrops on them and a pair of teal swimming shoes. Annie has a seven-year-old little sister named Allie, who always wears a green long-sleeved full-body rubber wetsuit with a four-leaf clover in the middle, a pair of yellow swimming goggles, a pair of chartreuse rubber gloves, a lime green swimming cap with yellow hearts on it and a pair of light green swimming shoes whenever she goes swimming. Annie's favourite activity to do is holding her breath underwater while sitting at the bottom of the swimming pool.