Electra was orphaned in the destruction of her hometown. She was saved by Captain Nemo and is his first mate on the Nautilus. She and Nemo share a past experience that's never fully explained. Electra is deeply in love with Nemo, although she also harbors a deep grudge towards him for the deaths of her family. She becomes extremely jealous of Grandis' infatuation for the Captain, igniting a heated rivalry between them for his love. She grows fond of Jean and his determination to learn about technology, seeing something of her long lost brother in him. Nadia, on the other hand, detests Electra and becomes increasingly (and irrationally) jealous of Jean's friendship with the First Officer (her inability to express her concern to Jean nearly ruins their own relationship); likewise, Electra fears that Nadia will somehow steal Nemo's heart away from her. Eventually, however, both women open up to one another.

In 1889, the world is on the pinnacle of great discoveries in technology. In mankind's grasp for the future, a sinister foe known only as Gargoyle, obsessed with restoring the former Atlantean empire to the glory it once held, begins his plans to take over the world. Nadia, with the help of a young inventor, Jean Raltique, and the mysterious captain Nemo of the submarine Nautilus, must fight to save the world from Gargoyle and Neo-Atlantis. Based on the Novel '20,000 Leagues Under the Sea' by Jules Verne. 
(Source: Anime News Network)

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Mother of voice actress [Honoka Inoue](https://anilist.co/staff/129363/Honoka-Inoue). She has held a long-running gag of being 'eternally 17 years old'.

[Synchronkartei](https://www.synchronkartei.de/sprecher/450/2)

Twin sister of [Marisa Della Pasqua](https://anilist.co/staff/153008/Marisa-Della-Pasqua)

Three years after the defeat of Gargoyle and Neo-Atlantis, a new threat has surfaced bent on bringing the world under his control. Geiger, using advanced robot technology, is attempting to begin a world war, and take control of the devistated world after the destruction has stopped. Once again, Nadia and Jean must fight to save the world, only this time from itself.
 
(Source: Anime News Network)

These short Omake "extra" episodes were included as a bonus on the Japanese LD set.

A shorter, more streamlined version of Nadia called "The Nautilus Story", which all but eliminates the filler arc and concentrates on the struggle between Nemo and Gargoyle. Some scenes in the more pivotal episodes are cut as well. The compilation series was made by Hideaki Anno, who was said to have been dissatisfied with the final result of the TV show. The Nautilus Story was only released in Japan on VHS and laserdisc.
 
(Source: TV Tropes, edited)

Medina La Lugensius Electra