Ducky discovers how to balance on a floating log while running. Soon Chomper, Ruby and Petrie are all trying to balance on logs - with hilarious results. But when Cera tries to prove that Threehorns are the best at the game, she gets swept away by the fast water! Can the kids' new log balancing skills help save Cera?

Littlefoot's longneck friend Ali returns to the Great Valley. But her new friend Rhett turns out to be a braggart. When the kids try to prove Rhett isn't as brave as he claims, their plan backfires. Suddenly, the longnecks believe Chomper is a threat to the Great Valley!