The story is about three grey whales trapped by frozen ice in Alaska. They didn't make their migration before the ice progressed and now they're stuck and can't make it to the ocean. Greenpeace gets involved and other government workers, the national guard, oil companies--it's a real collage of people fighting to free the whales. The best part is that it's based on actual events and the end credits show footage and photos of the real people.
It's a good family-friendly movie, but as I said, don't expect much more than your basic animal-centric kid movie.