Robert Lansing, John Anderson, Richard Erdman and Lee Meriwether star in this warm and compelling family drama about a compassionate scientist who forms an unlikely friendship with a magnificent killer whale named Namu. When his mate is killed by whale-fearing fishermen, Namu mourns his loss in the cove of marine biologist Hank Donner (Lansing). Despite his size and reputation, Namu demonstrates that his grief is profound and his sorrow genuine. A sensitive sea creature, he finds a true friend in Donner, who gains his trust and seizes the opportunity to study the elusive and misunderstood mammal. But Donner's only human allies are a young widow (Meriwether) and her sympathetic daughter. And in a heart-pounding race against time, the three must rally to protect Namu from angry fishermen and prove that their friend, like all whales, is a remarkable, intelligent and gentle giant.