The cubs learn about the endangered mudcats and decide to help them, but don't know what they look like and accidentally mistake them for a couple of wild pigs.
Buttons' Uncle Woodrow, Aunt Francine, and Cousin Bruce visit Chucklewood. However, when Bruce shows off in front of Rusty and the girl cubs, Buttons loses his confidence. How can he get his confidence back?
Buttons is caught in a dilemma; he has to choose to either go fishing with his father or go to Bearbette's birthday party. The cubs come up with a way for Buttons to do both.
Earthquakes are mysteriously occurring in Chucklewood Forest, and the cubs meet a young elephant and his mother, who were responsible for the tremors.
All the critters are forced to evacuate Chucklewood when they hear explosions from a mountain, which they think is a volcano.
A barrel of chemicals falls into the Chucklewood creek and Mother Nature becomes affected by it, which causes strange things to occur around the forest, like a rainbow at nighttime. The cubs set off to find a flower called the Shepherd's Goblet which will save Mother Nature and restore the natural balance in Chucklewood.
There's a rumor of food shortage in the forest, and the cubs meet a traveling trader named Claude; they exchange Abner's tools for a barrel of food, but it was full of straw. The cubs go on a search to get the tools back, and the search leads them from one critter to another who have used the tools.
The critters celebrate Chucklewood's birthday. When a bobcat named Jonah comes to Chucklewood, food starts mysteriously disappearing, and Jonah is accused of stealing and eating it. Buttons and Rusty set a trap to catch the real thief.
While the mothers are visiting Grandma Bear's, the fathers are in charge of doing chores and cooking dinner. Meanwhile, the bear cubs have an argument about whether boy cubs or girl cubs are better, Freddie decides to have a contest.
Jonesy reminds the critters that the Critter vet is coming to do some sort of inoculation. Meanwhile, the cubs set off for adventure, water rafting and camping, and are caught in the rapids. They reach a cave and meet a critter named Selma, who ran away from something scary.
When Rocky Ridge, which was on the other side of a ravine from Chucklewood, catches on fire, a skunk named Eugene escapes it and meets the critters. However, they find his scent a little disturbing.
The cubs enter a cave which leads them to an underground world, and there they meet a young dinosaur named Bubbles.
The cubs' folks are into serious arguments. They must think of a plan to stop the feud between their folks before it ruins their friendship.