|"D.W. Swims with the Fishes"|
|Number in season:||6B|
|Original Airdate:|| April 5, 2010|
February 2, 2009
April 14, 2009 
November 20, 2012
|Written by:|| Cydne Clark|
|Storyboard by:||Robert Yap|
"When Carl Met George"
"A Portrait of the Artist as a Young Tibble"
D.W. and James enter the preschool swim meet and recruit their older siblings to coach them. It all goes well until Arthur and Molly begin to get more competitive than D.W. and James.
Arthur says that the nicest people can lose control sometimes. Arthur then presents the Brain as an example. Brain was playing pinball while Francine was complaining, when Buster came out with popcorn and tripped on the cord, unplugging the game. Brain was furious at Buster and started chasing him around the arcade.
After the title card, D.W. is at the public pool swimming and is soon joined by James and the two win again. James told her he sped up after he saw Timmy behind him. The lifeguard then tells the kids she has news for them. D.W. tells her mom that they are having a swim meet and wants to win it.
At the public pool, Arthur and D.W. are there and they see James with his older sister, Molly. As D.W. and James are swimming Arthur talks to Molly and Molly tells him that she was forced to this and is hoping no one sees her.
Soon, D.W. and James get into an argument over whose lane they are in and they start splashing each other. Their older siblings break up the fight, however they are not done with one another yet.
Arthur and D.W. go to the store get a new swimsuit and Arthur and D.W. end up seeing James and Molly there and he then chooses another swimsuit for D.W. Early in the morning, Arthur wakes D.W. up to start practicing.
At the public pool, Arthur is busy waiting for D.W. to get dressed into the swimsuit and Molly appears and she and Arthur act surprised to each other there early in the morning. When D.W. and James finally come out after dressing in their swimsuits they are wearing almost identical swimsuits.
When they try swimming in their swimsuits, they sink to the bottom and Arthur and Molly have to rescue them. Both Arthur and Molly then continued training their younger siblings.
At preschool, D.W. tells James her hands are pruny and James still had his ear plug in from the morning swim and said he will be glad when tomorrow's race will be over. D.W. tells him she would wish him luck, but she wishes herself luck.
At the day of the race D.W. and James are encouraged by their older siblings to win and the race starts. Both D.W. and James have the lead and James then gets stuck. D.W. frees James and they continue racing. Emily, however, is the winner of the race and D.W. and James both came in second.
D.W. and James are given second place trophies and they hand the trophies over to their older siblings and they go back in for a swim. Molly tells Arthur that she felt she had won an award for Jerk of the Year and Arthur says to her that they had tied. Molly suggests they buy their younger siblings banana splits.
- The Brain
- 3rd Grade Male Dog (Number 3)
- Amanda Hulser
- 3rd Grade Male Rabbit
- Jack Weasel
- Mrs. Fink
- Emily's original appearance is seen near the end of this episode.
- Buster specifically said that he doesn't know Emily's last name.
- The Lifeguard makes another appearance in this episode.
- The swim meet is for preschoolers yet some of the unnamed third graders are participate in it and are even seen at the race.
- D.W. references Uni and the episode D.W.'s Snow Mystery by saying "Uni was just about to tell me where my snowball was."
- This is the second episode with Arthur and Molly as friends like in Arthur Makes Waves.
- Main article: D.W. Swims with the Fishes/Gallery