Splat does not want to have a playdate with Spike. Spike will break his toys and eat all of his candy fish! And he does not want to learn how to swim—water is horrible, scary, and wet! He's sure that this is going to be the worst day ever. But when the rest of their classmates rush straight into the pool, Splat and Spike find that they may have more in common than they thought. Will Splat overcome his fear of water and get into the pool? And how can he help Spike to do the same?