Flotsam and Jetsam are voiced by the late Paddi Edwards in the film and the television series. They speak in unison, finish each other's sentences, and entwine their bodies. The concept of their linkage is further heightened when their white eyes combine to form a single crystal ball, a portal through which Ursula can view the outside world. Ursula would remain in her lair, working from behind the scenes, and watching everything from the crystal ball.
Flotsam and Jetsam are the first to notice Ariel's infatuation with the world above. Upon witnessing the mermaid fall in love with a human, Prince Eric, Ursula sends Flotsam and Jetsam to propose a deal to Ariel. In making sure that Ursula wins the deal, Flotsam and Jetsam sabotage what would have been a successful kiss between Ariel and Eric. In the climax, Flotsam and Jetsam are accidentally killed by the trident when Ariel grabs Ursula's hair just as the sea witch fires a killing shot intended for Eric. Flotsam and Jetsam are notable for their efficiency (which is something not to take lightly- usually- especially in Disney movies, the henchmen, are clumsy and botch up every plan). Until they were killed, they succeeded at every task Ursula gave them, and due to that, Ursula, shocked that she killed her eels, sadly mourns for them, right before turning her attention and rage towards Ariel and Eric.
In an original draft for the ending, they also tried to capture Ariel when she tried to escape, and when Ursula killed them, she barely seemed to notice.
The eels appear in a few episodes of the television series, whenever Ursula makes an appearance. Unlike the film, where Ursula is affectionate and loving, in the television series Ursula is hostile towards the eels, often scolding and berating them.
Role in the series
Flotsam and Jetsam reprise their role from the original series, but also now get to have a boss battle of their own against Sora. it's rumored sometime after the moisode, that the Nega Chesure cat will resirect them and make them his souls slaves, and cause he said he's no longer like the other dark spawn, it's likely Flopson and Jetsem will change their ways, and become Nega Chesure Cat's spies, also with a new found abiliy to breath and even swim in air.