阿哈博（哈罗德·霍普金斯 Harold Hopkins 饰）是裴庞德号的船长，在一次航行中，阿哈博遇见了白鲸莫比迪克，莫比迪克袭击了阿哈博，咬断了他的一条腿，从此往后，阿哈博和莫比迪克成为了一生之敌。 伤势痊愈后，阿哈博便开始了他的复仇计划，整天驾驶着裴庞德号在茫茫大海中寻找莫比迪克的踪迹。仇恨的火焰烧灼着阿哈博的脑神经，让他的神智逐渐混乱。终于有一天，阿哈博发现了莫比迪克的踪迹，在长达三天的追踪之后，阿哈博终于刺中了莫比迪克，令其身受重伤，然而，莫比迪克并没有就此认输，而是负死顽抗，争斗之中，莫比迪克咬碎了小船，借用绳索套住了阿哈博，欲与他同归于尽。

In 1841, young Ishmael signs up for service aboard the Pequod, a whaler sailing out of New Bedford. The ship is under the command of Captain Ahab, a strict disciplinarian who exhorts his men to find Moby Dick, the great white whale. Ahab lost his his leg to that creature and is desperate for revenge. As the crew soon learns, he will stop at nothing to gain satisfaction.