Eco's grandniece, an undergroundling named Crystal, becomes Maggie's newest friend. Consequently, Galileo feels left out.
Stacks is overwhelmed with his new ability to roam through the marsh in a grocery cart. His mobile ways threaten to get the better of him.
Hegdish makes up a fantastic story about a fictitious monster to scare the groundlings out of their recently-harvested berries.
Hegdish takes his stick with him to do all the jobs Galileo find dangerous. When Mud won't go into the cave to find fertilizer, the others ask Hegdish if they borrow his stick.
Mud/Slinger become shallow when they charge their fellow groundlings purple pebbles for everything. Intent on getting more purple pebbles, they don't realize the river is overflowing to dangerously deep levels.
On a day that she annually gets presents at sunset, Maggie wants a secret peek at what Eco is giving.
Maggie's favorite tree is about to die, and Stacks predicts it will hit Eco's home when it falls. It puts two groundlings in danger: Maggie, who wants to stay with her tree until the end, and Eco, who resigns herself to stay in Hegdish's cave.
Eco grants Galileo the role of Sproutmaster, with responsibility for gathering the sprouts before an impending hailstorm. But the power corrupts Galileo. In an attempt to get the job done quickly, he turns bitter on the other groundlings.
Mud/Slinger discover a jack-in-the-box that Maggie gave them. Hegdish coaxes Maggie to take it, turning everyone's mood mad. Eco's story shows that someone's trash is another's treasure.
Hegdish strips colours from the rainbow and tosses them around to groundlings, provoking mood swings and making Eco weak.
When Hegdish rescues Mud/Slinger, they wait on Hegdish night and day, much to his regret.
Galileo stays up all night and has no energy left for a midnight search for blue roses that Eco is certain will bloom. When nightfall comes, Galileo can't sleep at all. Hegdish is restless, too – looking for the perfect scheme that would make Eco mad.
Galileo tries to elude Maggie to give up her mossy bear by making up a story about a secret club.
