The true story of Luna, a young, wild killer whale who tries to befriend people on the rugged west coast of Vancouver Island.

这群身手惊人的刺客，是向一位大师学到一身的本领。牠们藉助大海的力量，利用视觉和听觉计算成功的机率。接著，黑白相间、重达5吨的虎鲸乘浪上岸捕捉猎物，然后又静静地滑回大海。牠们是全世界唯一将这项本事练到完美的虎鲸群。如今，牠们将自身的猎食本领发挥到淋漓尽致。多年来，瓦迪兹湾的虎鲸刻意让自己搁浅，藉机猎食亚成年海狮。母虎鲸更是锁定体型庞大的象鼻海豹为目标。

大白鲨和虎鲸是大海中的顶级掠食者，一般认为二者不会相互挑战，但加利福尼亚游客目睹了海洋巨兽的顶峰对决，海洋生物学家分析这一非凡事件，揭示生物链顶端强者之间的关系。

The killer whale was long feared as a sea monster until, in May 1964, one was brought into captivity for the first time. This spawned a journey of discovery into the killer whale's true nature. 　　It quickly became clear, these were not mindless killers - they were, in fact, highly intelligent social creatures. Today, our understanding is deepening still further and the latest revelations are among the most sensational - not only will these top predators 'adopt' and care for injured and abandoned orphans, but it seems there's no longer just the 'killer whale'.

The killer whale was long feared as a sea monster until, in May 1964, one was brought into captivity for the first time. This spawned a journey of discovery into the killer whale's true nature. 　　It quickly became clear, these were not mindless killers - they were, in fact, highly intelligent social creatures. Today, our understanding is deepening still further and the latest revelations are among the most sensational - not only will these top predators 'adopt' and care for injured and abandoned orphans, but it seems there's no longer just the 'killer whale'.

Researchers from New Zealand investigate about the mysterious attacks of orcas to great white sharks in South Africa in 2017 and seek to discover if it will happen again.

没有多少人会跃入水中与重达6吨的食肉动物同游，也没有多少人能分享科学家英格丽德.维瑟对研究野生逆戟鲸活动的热情。她用独自游海的方式发现了新西兰是独特鲨鱼带和射线捕猎虎鲸的家园。而最近出现了令人担忧的趋势——濒临灭绝的种群规模并未上升，然而在2010年出现了不寻常的死亡数量。本片记录了英格丽德独自探究其中原因的使命，以及她的发现所揭示的，有关海洋健康的令人不安的新消息。