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.

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

Captain Watson is in pursuit of the Nisshin Maru when all three Japanese harpoon ships suddenly appear on out of the fog. The Sea Shepherds are completely outnumbered.

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.

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

Season Finale.The Sea Shepherds continue to attempt to disrupt the whaling fleet's operations. When the Yushin 3 tries to transfer a dead whale to the Nisshin Maru, Captain Watson maneuvers his ship to block the transfer resulting in a full-speed collision.

The series starts with a dramatic encounter with the Japanese Whaling fleet. The episode then flashes back to the maiden launching and departure of the vessel from homeport three months earlier. Paul Watson and the Sea Shepherds head back down to Antarctica for what promises to be their most intense anti-whaling campaign yet. However, no sooner does the ship leave port than the ship's Gyro breaks and they hit a massive storm the size of Australia

As the Sea Shepherds prepare for their fourth straight day of engagement with the Japanese whaling fleet, Andy and Simon argue with Dan over the best strategy for attack.

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.

The Sea Shepherds face a difficult 2013 campaign with the Brigitte Bardot and their helicopter unavailable. The fleet introduces a new ship, the Sam Simon. Former captain of the Steve Irwin, Paul Watson, is forced to step down due to an injunction preventing him from coming within 500 yards of Japanese whaling fleet. All four of the fleet's main ships feature a new captain, with Watson serving as an observer. The Steve Irwin remains to coordinate the operation. The Bob Barker is sent to search for the whaling fleet and finally locates the Nisshin Maru near the western edge of the whaling ground. However, they sit helplessly as the Japanese successfully kill and load a whale onto the factory ship. The Sam Simon is sent to search for the bunker ship Sun Laurel and finally locates it along with 2 Japanese whaling ships. They attempt to block the refueling, but fail when the rookie captain pulls away, not willing to risk his crew. After hunting, the Nisshin Maru turns east. Realizing that the factory ship is trying to also refuel, the Sea Shepherds send all their ships to interfere. 30 hours later, the ships prepare for the showdown. The 500-tons Bob Barker blocks the 5000-tons Nisshin Maru by parking right next to the Sun Laurel. The Japanese warns the Bob Barker to move but captain Peter Hammarstedt refuses to comply. The Nisshin Maru then pushes the Bob Barker with their bow, damaging the ship and causing it to list dangerously. After a standoff, the Nisshin Maru backs away while the Sun Laurel abandons the operation. Days later, the whaling fleet leaves for Japan with only 103 kills.

A huge weather system moves in and the Steve Irwin is forced to take shelter behind a large iceberg. By morning, they are surrounded by ice so thick they can no longer move. The ice begins to push against the aging ship's fragile hull, denting it inwards.

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.

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 Sea Shepherds depart on their 2010/2011 ant-whaling campaign with a new, fast interceptor vessel. Early on, they find two harpoon ships before the whaling fleet has killed a single whale. Could they be set up for their most successful campaign ever?

When damage happens to one of the small boats, and the Bob Barker is five hours away, the crew realizes that they will have to spend a night at sea. But the crew is wet and freezing already, and early symptoms of hypothermia begin to set in.

New Zealand's Navy contacts the Steve Irwin to respond to an emergency distress signal where five crew members from a Norwegian sailboat have gone missing. Now the Sea Shepherds must risk their lives in a dangerous mission to find the missing mariners.

In the fourth-season finale, Watson claims a major victory after 30 years of fighting, while he and the crew reaffirm their commitment to stopping the whaling fleet.

A plan to intercept the whaling fleet before it reaches the whaling grounds is nearing a critical point. The new helicopter pilot, Gary, spots a ship on the horizon; If it is the whalers' factory ship, this may be Sea Sheparhd's the earliest victory ever.

The Steve Irwin is quarantined in Hobart and the crew anxiously waits to find out if they have been exposed to Anthrax. Finally they get the all clear and 1st mate Peter Brown wastes no time leaving the ship after having quit the campaign.

Surrounded by the Japanese whaling fleet, the Sea Shepherds ready themselves for their biggest day of battle to date on the campaign. Helicopter pilot Chris flies up and confirms the crew's fears - all of the whaling vessels are equipped with LRAD weapons.

In the Season 5 premiere, the Sea Shepherd Conservation Society responds to Japan's 2011 announcement to resume its whaling operations in the Antarctic and the government's promise to beef up the fleet's security.

Low on fuel, the small boats head toward the Steve Irwin, but in order to get them on board safely, Paul must employ a dangerous military strategy, "The Crazy Ivan," circling at a high speed to try and create calm water for the little boats to return.

The Sea Shepherds shock turns to fury when the Japanese fleet pulls a dead whale onto Nisshin Maru for slaughter. Paul Watson instructs the crew to prepare for battle.

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 finally locate the factory vessel after months of searching, but it promptly tries to evade the Gojira.