At the farthest reach of the planet, Capt Peter Hammarstedt and Capt Sid Chakravarty of the environmental group Sea Shepherd risk their lives and the lives of their crew to patrol the Antarctic to stop illegal poachers. Aboard the ship, Bob Barker, Capt Peter finds the Thunder, a rogue fishing vessels so infamous that Interpol has an alert out for it. If they can successfully corner and shut down the Thunder, they could save masses of Antarctic toothfish from illegal slaughter. The poachers have a dangerous reputation and the Sea Shepherd captains know the mission will be risky. In Tanzania, the destruction of coral reefs by blast fishing - which uses explosives for mass kills - now threatens the legal fishing industry, which both supports and feeds some 18 million people along the coast. J.D. Kotze, a fishing crimes investigator and former South African police captain, joins an undercover team out to arrest the top explosives dealer and cut off the reckless industry at its root. If ... Written by Animal Planet

In Antarctica, excitement and anxiety rise as Capt Peter Hammarstedt and the crew of Sea Shepherd's Bob Barker go in dogged pursuit of the notorious poaching vessel, the Thunder, that leads them into a dangerous ice field that can trap and crush a ship in a matter of hours. As the chase heats up, a tense - and potentially dangerous - encounter looms. Eight hundred miles away, a second Sea Shepherd vessel, the Sam Simon captained by Sid Chakravarty struggles to haul up illegal gill nets that are wreaking havoc on all the marine life in the area. In Tanzania, JD, Mike and the team capture an explosives dealer and begin an undercover sting operation that gradually leads them up the chain of command to the so-called superdealer, for whom they set a trap. Journalist Jim Wickens joins a patrol to crack down on illegal fishing in Palau's national waters, which are a protected shark sanctuary. The enforcement team comes across a Vietnamese boat loaded with shark fins, and must now produce ... Written by Animal Planet

Tension escalates in Antarctica as the Thunder takes desperate measures to shake off pursuit by the Sea Shepherds. On the Bob Barker, Capt Peter narrowly avoids getting rammed by the poacher ship. Sea Shepherd's second boat the Sam Simon arrives in time to ramp up the pressure on Thunder. Along the Palau/Philippines border, the patrol ship comes across a mother boat, with a dozen of smaller boats attached to it. Journalist Jim Wickens encounters a weary assortment of poor Filipino fishermen, including a small boy who has been dragged out of school by his own father to fish for $100 a month. Their fragile boats, which are taken into the Pacific Ocean on daily fishing runs, are hauled in and their illegal catches confiscated. An intricate sting operation goes into play in Tanzania, where cameras track the dramatic arrest of J4, the superdealer whose explosives drive the bomb-fishing industry. Written by Animal Planet

The Sea Shepherds approach the Thunder in a small boat, making an effort to communicate directly with crew of Thunder by throwing messages in a bottle onto the poacher's ship. Suddenly a man in a black balaclava appears on deck and hurls bolts and flares at the activists and someone is hit. Unexpectedly, the Sea Shepherd's effort is bolstered by the sudden arrival of a commercial fishing boat that joins them in the fight. Greenpeace's flagship vessel, the Rainbow Warrior patrols the Pacific Ocean on the lookout for illegal shark fishing, an industry that feeds the demand for shark fins as a delicacy of Chinese cuisine. When a captain allows them to inspect his boat, the environmentalists explore deep within the vessel to discover a prolific, and illegal, bounty. In Tanzania, the criminal investigation leads J.D. Kotze and his team to a motherlode of explosives, as well as a cache of materials used for bomb-making. Now in custody, superdealer J4 gets the third degree as investigators ... Written by Animal Planet

The captain of the Thunder sends out a mayday alert and calls on Sea Shepherd to rescue his crew. Jim Wickens turns his focus to high seas slavery in Indonesia. And Greenpeace clashes with fishermen while protecting the rare vaquita porpoise.

As the Thunder sinks, Sea Shepherd race to collect evidence of the vessel's illegal activity. In Mexico, the crew of the Farley Mowat rescue a large whale. And in Indonesia, Jim Wickens joins a dramatic chase that results in the destruction of 3 boats.