An iceberg shears from a glacier and begins a journey that takes it through Antarctica's seasons, meeting many creatures along the way. Follow the iceberg through the seasons, first in the spring as it watches penguins trek across the ice to their winter homes and senses krill stirring underneath the ice. With summer comes more life: the iceberg sees humpback whales spiral and orca gather. And the iceberg moves too, ever shrinking as the sun softens its edges and undersea currents wash it from below. When autumn arrives with cooling temperatures, the sea changes and the iceberg is trapped in the ice for the winter freeze. Then spring returns and the iceberg drifts into a sheltered bay and falls, at the end of its life cycle.