Seadramon is a sea dragon digimon that was stabbed into darkness by Facilier in order to provide Dark Cynder with another monster to her monster armada. It has a long, serpentine body, which it uses to wreathe itself around enemies that are coming to attack, and constrict until the enemy suffocates. Naturally, it doesn't have intelligence or speech, and it swims around the Net Ocean leisurely according to its instincts.
During their first night in the Digital World, the DigiDestined come across an abandoned trolley car on the shores of Dragon's Eye Lake, where they decide to spend the night. However, Taichi "Tai" Kamiya and Agumon accidentally strike a large, red, leaf-like object with an ember from the fire, and it turns out to be the tail of a very angry Seadramon, who retaliates by dragging the chunk of shore with the trolley car on it to the middle of the lake. Yamato "Matt" Ishida is the only one not on that part of the shore and leaps into the water to save the others. Seadramon notices him and grabs him with his coils. To save him, Gabumon digivolves to Garurumon for the first time and battles Seadramon, seeing him off. Garurumon It is implied by its Digimon Analyzer profile that the MegaSeadramon in Myotismon's army is this same Seadramon. City Under Siege
Seadramon is the digivolved form of Betamon, the partner of Michael Washington, an American DigiDestined. He digivolves the first time when the group, who is in Digitamamon's restaurant, is attacked by a Dark Spiral controlled Gorillamon. Seadramon then attacks Gorillamon and drags him underwater, until Togemon destroys the Spiral. The Samurai of Sincerity Michael and his Seadramon show up again later when Digimon begin to appear in the Real World around Christmas time and battle a Cherrymon at Rockefeller Center with help from ExVeemon, Lillymon and the other American DigiDestined's Digimon. Digimon World Tour, Pt. 1
Role in the series
Seadramon first appeared as a reinforcement monster to Dark Cynder in Quest for Camelot. Seadramon was amung the attackers, and was the few last ones to be defeated after Kuwagamon and Shellmon, defeated by Garuamon, after which, followed theretreat of any remaining leagers, (Notably the Anaconda and Dil the croc) with only Dark Cynder and Lord Cobra (and in lesser exstent, Dr. Blowhole) remaining, which are later defeated. however, though not very well explained, Seeadramon had ended up in Atlantis and was cure of it's darkness by Kida, who used he cysteil shard to heal it wounds and the darkness within it as well, and now becoming a guardian of Atlantis, aside from the royal atlantian guards and the giant macanical Levaithan. it later appeared as a reinforcement character for the Shell Louge Squad, due to the appearence of the Atlantian team in SpongeBob and Friends Meet Hercules, while rephraseing the role to stop Rourke again, like it did in SpongeBob and Friends Find Atlantis, also provade a way to break in the underworld (with little help from the underworld gate keys) to allow the louge to have one last confrountion with Hades and some remanients of the Villain leagers asigned to him.