When a melting glacier bursts through an ice dam, the Rushing Waters river is set loose on an old growth forest. The flood surrounds an ancient tree, where impish, stick creatures - the Old Seeder Twigs - are stranded. Their fate is tied to an enormous, sinister beaver named Slapper - the chomper colony leader. A young Twig named Leaf and his fearless friend Rustle fly on a gigantic leaf over dangerous grasslands seeking help from the fearsome Slapper. Unexpectedly, jittery chipmunks and a mysterious Twig stranger join the perilous mission, and offer protection. Still, the journey proves far...