Two beavers thwart an evil plot by penguins who plan to turn Beaver Island into a frosty resort.

A twelve-year-old girl and her two best friends determine to rescue two orphaned beaver kits, and soon find themselves trying to solve a local environmental crisis.

Five little beavers, working feverishly to build a dam, are enticed one by one to leave their endeavor to play with other animals on the river bank, leaving one tired beaver to finish the job.

Ace and Bub stand up to nearsighted Captain Jo Jo and his crew of moles, who are stealing dirt from Beaver Island to make their own island home bigger.

When Ace and Bub compete in a race to win a new houseboat, they unwittingly plant fast-spreading vines instead of trees on the Shark Tooth Islands, forcing their inhabitants to live in the sea.