On a remote island a young scientist wades into the breakers and slaps the water. Within seconds a fin comes slicing through the foam and the huge, streamlined bulk of a Killer Whale comes to rest in the shadows a few metres away. The man and the whale stare at each other, both curious to know more. This is a study of the world's largest mammals, the killer whales, the most cunning and intelligent hunter of the sea. Narrated by David Attenborough Best know for the whale and baby seal episode.