This is the complete list of the characters of seaQuest DSV, renamed seaQuest 2032 during its third and final season. The series went through significant cast changes after every season it was on the air.

Table of main cast members

First season cast.

First season main characters

Second season main characters

Third season main characters

Third season recurring characters

• Dr. Perry (Karen Fraction) – When seaQuest returned to Earth in 2032 after mysteriously disappearing ten years earlier, Dr. Wendy Smith was among the fatalities suffered in the Hyperion Civil War the seaQuest was forced into in 2022. With no Chief Medical Officer, Dr. Perry signed aboard the ship as Smith's replacement.^[18] During her time on the ship she performed several important tasks that save countless lives. Dr. Perry and Lucas were able to synthesize a cure for a mutated viral strain that threatened the crew of seaQuest.^[21]
• Lt. Commander Heiko Kimura (Julia Nickson) – A Chaodai sub fighter pilot that defected to the UEO in 2032 to warn them of the future threat posed by the Chaodai. She conducted an online relationship with Lt. O'Neill and used him to find the ship and get on board. When Tim confronted her about it later she told him that she didn't feel bad about tricking him, because the Chaodai represented a horror he couldn't imagine, and that he should have been glad to have his fantasy girl for as long as he did. Had the show continued she would have been a main character going forward.

UEO Personnel

• Secretary General William Noyce (Richard Herd) – Ranked as admiral in the UEO navy, Noyce had served with Captain Bridger for many years prior to his appointment to seaQuest. Noyce was usually seaQuest`s liaison to UEO Headquarters and often relayed mission orders and other commands to the ship. Noyce had met future UEO secretary general Andrea Dre at Woodstock when his own car broke down. They remained friends for years afterwards. Noyce was made acting secretary general in the episode "The Last Lap at Luxury" following Dre's arrest for treason, forcing him into retirement from his military career. He appeared with the title in two earlier episodes, "The Stinger" and "Hide and Seek", suggesting the episodes were aired out of order.
• Secretary General Arthur McGath (Michael Costello) – Replacing William Noyce as the Secretary General of the UEO, McGath was frequently in contact with the seaQuest to issue new orders and missions. Possessing a high amount of respect for Captain Bridger, McGath refused to relieve him of command when a gold helmet believed to be from Atlantis cursed Bridger and caused him to behave irrationally, claiming he didn't want the last thing on the captain's record to read "relieved of command by the Secretary General".
• General Francis "Frank" Gideon Thomas (Jesse Doran) – A General seen in the US Army in 2019, then in the UEO Army as of 2021. Thomas was involved in a murder cover-up in his early adulthood involving Alison Brody resulting in the death of her friend. Realizing that she would be able to testify against him, Thomas conspired with a corrupt doctor to infect her with a fatal virus so that she wouldn't be able to incriminate him. Years later, Alison Brody, who had been in cryogenic stasis since her infection, emerged from her sleep. Worried, Thomas had her kidnapped and planned to kill her once and for all. Lieutenant James Brody, her son and member of the seaQuest crew, was able to intercept the general and rescue his mother. Although Thomas' fate is unknown, it can be inferred that he was likely discharged from the military due to his actions and sentenced to prison.

seaQuest Crewmembers

• Chief Carleton (Dan Hildebrand) – One of the Lead helmsman aboard seaQuest, Carleton came on board after Stark was removed from command but before Bridger assumed command. He was a main fixture on the bridge from 2018 to mid 2019. He was on duty when the boat was heavily damaged after a lightning bolt struck the ship's communication's buoy. He, along with the bridge crew, was able to reroute power from one of the ship's WSKRs, operate the vessel, and save a downed French submarine. Carleton eventually left the ship and was replaced in 2019 by Chief William Shan.
• Lieutenant Dalton Phillips (Mark Fauser) – One of the weapons officers aboard the seaQuest, Phillips had served under the command of Captain Marilyn Stark prior to her dismissal as captain of the ship. When Bridger assumed command of the boat, Phillips remained on board.
• Dr. Joshua Levin (Timothy Omundson) – A member of the seaQuest`s science and medical team. Assigned to the Aqua Sphere 7 outpost later that year, Levin, as well as the rest of the away team became infected with an unknown virus spread to the station by the sunken French space station Liberté. He, along with the rest of the away team were eventually cured and he remained onboard seaQuest for the rest of the year.
• Chief William Shan (Dustin Nguyen) – One of the helmsman of the seaQuest, Shan was born in Brazil in one of the favelas prior to the newly formed Amazonian Confederation and is a descendant of Vietnamese boat people. He possesses extensive knowledge of his people's background and speaks Portuguese. A capable combat officer, Shan was often part of Chief Manilow Crocker's security teams.
• Helmswoman Tyler (Dorian Field) – One of the helmsman of the seaQuest, Petty Officer Tyler joined the crew in early 2022, replacing Helmswoman Mackay. She faced some difficult situations during her tour on the ship. She was on duty when the UEO was being threatened by a powerful psychic, known as the Avatar, she was able to overcome the side effects caused by the "psychic battle" between Smith and the Avatar and keep control of the helm.

Scientists

• Malcolm Lansdowne (Robert Engels) – A long-time friend of Nathan Bridger's, Malcolm Lansdowne maintained a dolphin research facility in the Caicos Key. When Darwin took ill during a mission to investigate a black smoker, Lansdowne was able to eventually determine that it was the bacteria in the smoker that had infected him in the first place. When Max Scully had attempted to thwart the efforts of whaling ships, he borrowed an extensive amount of money from Lansdowne in order to purchase an old-style Foxtrot-class submarine to combat the whalers.
• Martinson Hologram (W. Morgan Sheppard), "The Old Man", is the holographic representation of Professor Martinson was designed to offer a sounding board to the ship's captain in the event of a crisis. Although the navy refused to install the program, Lucas brought him on-line nevertheless. During his first year as captain of the seaQuest, Bridger confided in Martinson frequently and the hologram was able to provide invaluable information as well. When environmental extremists captured seaQuest, Martinson was able to adequately distract one of them, allowing Lieutenant Krieg to lock him inside Bridger's quarters.
• Dr. Raleigh Young (Roscoe Lee Browne) – A specialist in underwater volcanoes, Dr. Raleigh Young had developed a special "magma buoy" which could be launched into an undersea volcano and remain functional, despite the intense heat, which would allow researchers to know in weeks what originally would have taken years. Somewhat hypersensitive, Dr. Young could not understand why Captain Bridger would choose to worry about a sick dolphin rather than his important research. However, he soon came to understand Bridger's reasoning and implored him to seek a cure for his ailing friend. His magma buoy was eventually launched.
• Commander Scott Keller (Kent McCord) – Commander of the space shuttle Wayfarer, the first manned Earth vehicle to reach Mars and back, Scott Keller had attended the naval academy with Nathan Bridger, with whom they remained competitively friendly. One night, as a favour to Bridger, Scott ate a dozen and a half of Organa Watt's, the woman who ran the women's dorm at the academy, terrible cookies so Bridger could sneak a girl out the back. However, while Keller opted for outer space, Bridger opted for inner space. Bridger and seaQuest eventually rescued Scott's Wayfarer capsule after an accident during re-entry forced them to splashdown near the Montegnard Confederation. He was eventually involved in the Hyperion civil war, with his final fate being a mystery.
• Professor Tobias LeConte (Mark Hamill) – Blinded by the magnificent light of a comet, Tobias was a child prodigy. At seven years old, he pinpointed the exact moment the universe was born. By age fourteen, he held Isaac Newton's chair at Cambridge. However, he was not fully human. Born on the planet Hyperion, eleven million light-years away from Earth, Tobias sent out a message of peace on a planet of conquest. His anti-expansion philosophies branded him a traitor for which he was sentenced to death. He fled to Earth and melded with the real Tobias LeConte, essentially giving the child life as the comet that blinded him also would have given him cancer, which his alien physiology was able to naturally fight off.

Adversaries

• Maximilian "Max" Scully (Jonathan Banks) – A radical environmental activist who faked his death in the year 2011 after being disfigured by a bomb explosion he intended to use himself. By the late 2010s, Scully had borrowed money from Malcolm Lansdowne to purchase an old Russian Foxtrot-class submarine which he and his crew originally used to monitor the movements of illegal whaling ships. Convinced that the UEO wasn't going to do anything about the whalers, Scully took matters into his own hands and began firing live torpedoes at the whalers. Unfortunately, during one such instance, a torpedo missed its intended target and sank a cruise ship accidentally. His crew abandoned him and Scully eventually was apprehended by the seaQuest. Rather than be taken into custody, Scully launched himself out of a torpedo tube, leaving Captain Bridger to destroy his abandoned vessel. Scully was believed to be all but dead considering that he was nowhere near any land masses and had no choice but to swim to save himself. Somehow, Scully was able to survive and developed an undersea colony dedicated to the preservation of the Earth called "Ecotopia." Although he was still wanted for the deaths of the passengers of the cruise ship, the UEO granted him a full pardon when Ecotopia became a member of the UEO in 2032. Scully's ideals still had not changed as he took advantage of his tour of seaQuest to tap into the main computer of the sub. From Ecotopia, he was able to disable the ship's life support system and directed seaQuest`s pulse lasers at an underwater nuclear waste dump - the intention being to destroy the Human race, save for those within Ecotopia, whose descendants would return to the surface of the Earth generations later and protect the planet's environment, rather than ravage it. Scully was defeated by Captain Hudson, Lucas, and Elaine Morse, who managed to kill him. Even though his plans were thwarted, and a nuclear holocaust was prevented, Lucas hoped though that the peaceful Ecotopia colony would be Scully's legacy, not his lunacy.
• Mariah (Sam Jenkins) – Leader of the G.E.L.F. colony uprising, Mariah sought freedom for her and her people on their twenty first birthday in 2021. First seizing control of the colony, she led a group of daggers to UEO Headquarters in New Cape Quest. Once there, she captured General Thomas and a fully armed Navis-18 UEO submarine. Using Thomas' military command codes, she was able to gain access to the Ronald Reagan Memorial Laser Space Base where she plotted to destroy enough the world's air exchange plants, which would suffocate the human race, leaving the G.E.L.F.s as the only sentient life on the planet. She halted her plan when she realized that the G.E.L.F. baby that had recently been born at the colony was more human than her parents were due to spontaneous evolution and that destroying the human race would result in the ultimate destruction of the G.E.L.F.s as well. She released General Thomas and was imprisoned in a UEO detention facility.
• President Alexander Bourne (Michael York) – President of the Macronesian Alliance (formerly New Australia), Bourne rose to power during the ten years that seaQuest was missing. The ships in his naval fleet, the Lysander class, were capable of subduction; particle liquefication, which "turns land mass into soup" and allowed him to seize power in half of the Pacific Ocean. Bourne did not agree with the policies and limitations of the UEO and sought any means to discredit and defame them. As a result, and because of several concerns about human rights violations, the UEO imposed a trade embargo against Macronesia, which led to several conflicts between both governments.
• General Armand Stassi (Andrew Stahl) is Alexander Bourne's right hand man and the Highest Ranking officer in the Macronesian Military. He was with the President in the attempted take over of the Nexus Colony, which was ultimately thwarted thanks to the return of seaQuest and the help of Nathan Bridger.^[18]
• Larry Deon (Tim DeKay) – A business tycoon who served as chairman of Deon International, the largest supplier of most of the world's goods and resources. Deon International also operated restaurant chains, military development groups, and major sports franchises, such as the "Deon Demons". Deon, who "sold IBM off at a yard sale when he was 24", sought to conglomerate his empire with the entire world market, making Deon International "the only game in town". As manufacturer of the, allegedly, state of the art Lysander-class subfigher (high speed submersibles capable of engagements at speeds up to 300 knots), Deon International was able to neatly furnish Macronesia with their underwater war machines. Larry would soon conspire with President Bourne's attempt to assassinate Secretary General McGath in order to abolish the UEO. Captain Hudson was able to stop him and planned to bring him to justice, but before he could say anything, Mason Freeman, Deon's right-hand man, shot him to prevent Larry from incriminating himself or the company. While he was seriously injured, Deon was not killed. He remained in a coma.
• Mason Freeman (Ralph Wilcox) – Larry Deon's right-hand man, Freeman is more aggressive, ruthless, and in many ways, more cunning than his boss is. Larry ordered him to capture Captain Hudson and hold him hostage to further ensure that an iceberg in the Weddell Sea would not be destroyed by seaQuest. Hudson was able to overpower Freeman, but rather than send him to a UEO prison, he ordered Freeman sent back to Deon, to tell Larry that while he sent his best man, Hudson sent him right back.^[18] Freeman was later sent to sabotage the OmniPacific underwater train in order to keep Deon International's air travel services number one in long-distance traveling. Mason's efforts were thorough, but Lucas was able to safely stop the train and save the passengers. Freeman, however, was able to escape. Apparently not on speaking terms with Larry, Freeman shot his boss after Captain Hudson had arrested him, in order to stop Larry from incriminating Deon International in the plot to assassinate Secretary General McGath. Freeman was immediately arrested and imprisoned. Freeman, and Jason Pardee, a former love of Lieutenant Henderson, were able to escape prison and held a science team hostage in exchange for their own freedom. Freeman was also able to take Lucas and Henderson prisoner after they were sent over to the science station under the pretense of assistance. Plotting to kill Lucas to send a message to Captain Hudson, Henderson, Lucas, and the science team were able to escape. While Pardee was killed at the hands of Henderson, Freeman seemed to disappear. As the seaQuest futilely tries to find him, he happily rolls along the ocean floor in an underwater tank, singing to himself in contentment.

Others

• President Hoy Chi (James Shigeta) is the President of the Montagnard Confederation. Chi had wished his state to remain a peaceful and supportive member of the UEO, but, also an important player within it.
• Julianna (Sarah Koskoff), AKA "Red Menace", was a brilliant computer hacker who worked alongside Martin Clemens (AKA "Mycroft") and Nick (AKA "Wolfman") in an attempt to make right the perceived wrongs of the world by diverting stolen funds from corrupt governments into places where they would be better served, such as hospitals.
• Navy Quartermaster Bickle (Denis Arndt) serves as a navy quartermaster. He was used to dealing and trading with Lieutenant Ben Krieg and had formed somewhat of a sarcastic relationship with him. While Bickle was highly qualified at his work he had an acrimonious relationship with his wife. Krieg had promised to turn him onto a good divorce lawyer, but Bickle was less than convinced since Krieg had to salute his ex-wife, Lieutenant Commander Hitchcock.

References