Tom and Cassy's investigation a prep school teacher's apparent suicide uncovers his affair with a student.
On their final voyage, the crew learns that O'Neill's cyber-friend is a defector of the Chaodai, a powerful Asian force with anti-sub weapons. Drawn into dangerous waters, the seaQuest crew unites in a life-or-death battle against the Chaodai.
After filling in as a weatherman at the station, Eric learns a lesson that fame is as unpredictable as the weather.
Eric learns that fame is as unpredictable as the weather.
During a stopover at a penal colony, Lt. Henderson learns her former lover is a prisoner there and unwittingly instigates a riot. Henderson's ex escapes with Larry Deon's partner, Mason Freeman, and the two desperados seize hostages.
When the UEO's charter comes up for renewal, corrupt businessman Larry Deon teams up with President Bourne to control the outcome. The duo's deadly plot involves turning Lt. Fredericks into an assassin. Michael York guest stars.
A mechanical malfunction sends the seaQuest back in time to 1962, where the crew gets caught in the middle of the Cuban missile crisis. As the clock ticks down, the seaQuest team attempts to prevent nuclear war. Brittany Murphy guest stars.
Determined to get their hands on top secret information that could ruin their lives, Bridger and Ford head up a mission to retrieve data crystals from a UEO base that is now under Macronesian control. Roy Scheider guest stars.
When Max Scully returns, Hudson is charged with accompanying the extreme environmentalist to an underwater ecological paradise. But can Scully, who faked his own death twice, really be trusted? Jonathan Banks guest stars.
As the seaQuest crew tries to stop a highly contagious virus from turning into a pandemic, Lucas is drawn into a confrontation with former commander Capt. Bridger over how to stop the pathogen from spreading. Roy Scheider guest stars.
On a mission that leads Brody into a life-or-death situation, Capt. Hudson and the rest of the seaQuest crew set out to save Lt. Henderson from a death sentence decreed by her captor, President Bourne. Michael York guest stars.
Nuclear war looms on the horizon after power-hungry Adm. Vanalden fires missiles at an encampment in Macronesia. The UOE orders seaQuest's Capt. Hudson and his crew to take control of Vanalden's heavily fortified underwater base.
Morally bankrupt businessman Larry Deon sets out to destroy a new underwater train on its maiden voyage. Lucas is charged with ensuring the train gets safely to its destination, and Ford and Henderson hop aboard for a secret date.
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