In the dubbed version it was called Giant Jellyfish
Jellyfish could negate electrical attacks aimed at any monster on a Water field.
In episode 7, Mako Tsunami uses this card during his Duel against Yami Yugi. He sets this card in Defense Position. Yami Yugi then attacks this card with "Feral Imp" (whose ATK was 2000 due to it being equipped with "Horn of the Unicorn"), but since this card can absorb electrical attacks, the attack only flips this card face-up. This card then gains a Field Power Bonus. Yami later uses "Giant Soldier of Stone" to destroy "Full Moon" which makes the water recede away and expose Mako's monsters. All of Mako's monsters then lost their Field Power Bonus. Yami then summons "Curse of Dragon" and activates "Burning Land" to allow "Curse of Dragon" to attack all of Mako's monsters once each. "Curse of Dragon" then attacks and destroys all of Mako's monsters, winning Yami Yugi the Duel.
In the dub, this card was mistakenly shown as Umbra's set card in his Lumis' duel against Kaiba and Yugi.