The two play a similar role in the game as the movie. They taunted Ariel into thinking that Ursula will let her venture to other worlds if she traded the trident for her dream to come reality. Ursula sent Flotsam and Jetsam off to search Triton's palace for the Keyhole, but they were unable to find it. They later fought Sora and co. in Ursula's lair. After the fight, they curled up and die in a mist of ink.
In Kingdom Hearts II, Flotsam and Jetsam have returned probably the same way Ursula did. They only briefly appear in the song-battle 'Ursula's Revenge'. During the song, the two eels tried to suffocate Sora, but were destroyed when Donald and Goofy pull them off of Sora, allowing him to finally destroy them with a blast of magic from his Keyblade.
In the film, Ursula used Flotsam and Jetsam to manipulate Ariel into visiting Ursula. They used their sly and cunning ways to convince her into thinking she will live forever with her love, Prince Eric. They were both killed when one of Ursula's wayward shots of the King Triton's Trident hit the pair of eels.
|Introduced in Kingdom Hearts|
|Maleficent - Hades - Jafar - Oogie Boogie - Ursula - Captain Hook|
|Queen of Hearts - Card Soldiers - Cerberus - Rock Titan - Ice Titan - Clayton - Sabor - Iago - Monstro - Lock, Shock, and Barrel - Flotsam and Jetsam - Glut - Smee - Chernabog - Honey Bees|
|Introduced in Kingdom Hearts II|
|Pete - Captain Barbossa - Scar|
|Shan-Yu/Hayabusa - Hydra - Pain and Panic - Undead Pirates - Shenzi, Banzai, and Ed - MCP - Sark|
|Introduced in Kingdom Hearts Birth by Sleep|
|The Queen - Magic Mirror - Lady Tremaine - Anastasia - Drizella - Lucifer - Maleficent's goons - Gantu - Experiment 221|
|Introduced in Kingdom Hearts 3D: Dream Drop Distance|
|Claude Frollo - CLU - Rinzler - Black Guards - Beagle Boys - Julius|
|Introduced in Kingdom Hearts χ|
|Introduced in Kingdom Hearts Union χ|
|Introduced in Kingdom Hearts III|
|Lava Titan - Tornado Titan - Mother Gothel - Randall Boggs - Hans - Davy Jones - Cutler Beckett - Kraken|