The Sea Shepherds embark on another dangerous campaign as whaling season begins in the Antarctic; a donation from former game-show host Bob Barker allows the group to purchase a former Norwegian whaling vessel.

A Japanese reconnaissance ship pursues the Steve Irwin; two members of the Andy Gil crew suffer illness and injury; the Bob Barker's engine fails two days into its journey.

The Sea Shepherds have been relentlessly followed by the whaling reconnaissance vessel for two weeks. They find themselves in a full-on engagement on the high seas as Captain Paul Watson orders a massive butyric acid bottle attack on his nemesis.

The Sea Shepherd's stealth boat, the Ady Gil, launches a sneak attack on the Japanese whaling reconnaissance vessel in an effort to break free of the tail and find the rest of the whaling fleet.

After nearly a month of searching, the Sea Shepherds have finally found their ultimate target: the world's only whale factory ship, the Nisshin Maru.

At the bottom of the world, a collision has just devastated one of the Sea Shepherds' vessels. The crew on the other vessel stand helpless on their deck, watching in horror as the Japanese vessel barrels through the Sea Shepherds' prized speedboat.

In the aftermath of the devastating loss of their stealth vessel, the Sea Shepherds have returned to the campaign with renewed passion and intensity. Now the two remaining ships are back on the hunt for the Japanese fleet.

With low oil and drinking water, and a damaged helicopter, the Sea Shepherds' hunt for the Japanese whaling fleet has been brought to a halt. While on their way back to port, the radar shows two colossal storms that they can't avoid.

As the Sea Shepherds approach the Nisshin Maru, they are suddenly surrounded by four whaling vessels. Suddenly, one of the Japanese vessels moves in dangerously close, and as the deck crew quickly braces themselves, the ships violently collide.

The Sea Shepherds refuse to be bullied by the Japanese fleet even though they're out numbered. The deckhands repel over the side of the ship to assess the damage from the collision and realize that there is a gash in the steel hull and water is pouring in.

The whalers face new attacks from the Sea Shepherds as they mount an attack with both the Bob Barker and Steve Irwin.

The former captain of the Ady Gil goes for a boarding attempt and one of the Sea Shepherd vessels goes dead in the water.

The whalers attempt to lose their attackers in an ice field.

Pete Bethune recounts his experience aboard the Japanese security vessel.