D.W. wants to swim at a backyard pool belonging to Molly, the toughest bully in school. Can Molly and Arthur secretly be friends? Meanwhile Grandma Thora adopts a new little companion, but the neighborhood welcome is reluctant.
Prunella and her mom both share a special bond over yoga, but when Marina joins in, will Prunella be left out? Meanwhile Arthur takes on Brain in a checkers match, but he finds the fan support too overwhelming.
Francine and the Brain make the city's elite traveling team, but is it missing the element of friendship? Meanwhile Emily is jealous of a glittery glass ball D.W. has found, and begins telling lies to get what she wants.
D.W. wants a drum set like what the Tibble Twins have, but her mother tells her she can't get one, so she'll have to improvise. Meanwhile Buster spreads around an urban legend, but can he find the truth behind it for once?
Binky learns he has a peanut allergy. He worries it will limit his life, and worse still, his mother is being way too overprotective. Meanwhile the Brain is pestered by the new corporate music his parents are playing in the ice cream shop.