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.
The exhausted Shepherds wrap up the initial leg of their campaign; the Steve Irwin is tipped off to the location of the Nisshin Maru.
The New Zealand Navy asks the Shepherds to assist in rescuing missing Norwegian mariners.
The Bob Barker hunts for two boat crews lost during a dangerous mission. Meanwhile, the Gojira finds the whalers’ refueling vessel.