The United Earth Oceans Organization recruits Captain Nathan Bridger to command SeaQuest DSV who was left without a captain when the previous captain was relieved of duty. Bridger is not enthusiastic about rejoining the militaristic organization, but when a pirate submarine endangers lives, he feels obligated to help, especially when the captain of the pirate submarine turns out to be the recently fired captain Marilyn Stark, the previous captain of the SeaQuest.