The sub risks destruction by granting asylum to a hi-tech warrior fleeing a warlike society.

On a diplomatic mission, Henderson discovers that her former love is now a prisoner and forced to work as slave labour.

Captain Hudson and his crew race against time to thwart the assassination of a high-ranking diplomat by the villainous President Bourne by use of Fredericks' psyche-implant.

A reactor accident sends seaquest back in time to an alternate 1962, where the Cuban Missile Crisis turned to nuclear war.

Bridger returns to retrieve some experimental data from years ago that was done on GELFs.

Max Scully returns, this time as a leader of an underwater colony, but his intentions are far from noble.

Lucas faces up to Bridger over his risky solution to combat a dangerous organism which threatens to reach epidemic proportions.

Henderson is captured by Macronesia and sentenced to death, so Hudson leads an undercover team to free her from the secure facility.

Hudson must relieve his old commanding officer from duty aboard a heavily armed underwater base.

Problems arise when three members of the crew take a ride on the maiden voyage of an under water high speed train.

Captain Hudson is assigned to protect underwater mining ships from hijackers and learns an old flame will be in joint command of the operation.

The submarine crew get involved in a businessman's scheme to use refugees and an iceberg to further his financial and political gains.

The adventurous crew narrowly escape total destruction on a distant planet and are transported back to Earth.