Twelve-year-old Todd Butroche has been rather distracted by a girl in middle school and other concerns, and the Toddlians, the tiny civilization created by his benevolent grossness, are convinced that he is angry with them--especially when they are confronted with a vile red thing (a moldy apple) and its horrifying inhabitant (a worm).
Molly claims to be too busy to tidy up when she makes a mess, but things change when Grandma invites her for a sleepover and she cannot find her Sloppy Bear.
Timothy Limpet feels out of place in the troll family. He likes things to be just so, and most trolls, frankly, don't. Tabitha Lumpit likes things to be loud, loopy and messy and she feels a fish out of water in her very neat family.
Destructosaurus comes in from the ocean, and makes a big mess. The narrator yells at him until he realizes that Destructosaurus is just looking for his Teddy bear. He apologizes for yelling and gives Destructosaurus a hug. However, Destructosaurus leaves before cleaning up his mess.
After failing to find his favorite sneakers in time for the big basketball game, Jumper the rabbit learns how to put his room in order by organizing his possessions.