The latest marine adventure by Greg MacGillivray, dean of Imax ocean films, celebrates the resurgence of a once-endangered mammal and showcases it in large-as-life action, among crystalline waters and psychedelic swells of krill. Immersive in ways that not many movies can claim, Humpback Whales is a prime example of the power of large-format documentaries to educate, delight and inspire. The first Imax starring vehicle for the titular cetaceans, it’s sure to have a long life at science centers and aquariums.