MegaSeadramon

MegaSeadramon is a Data-type Digimon; therefore, they can be good or evil. Myotismon had an evil MegaSeadramon patrolling the waters around the original Digidestined's home city. It attacked Joe, TK and Gomamon as they travelled into the city. Gomamon transformed into Ikkakumon to battle MegaSeadramon, but the sea serpent overpowered him. Just when MegaSeadramon was about to win, Joe's Crest of Reliability activated, enabling Ikkakumon to transform into the Ultimate-level Zudomon and win the battle.

Later on, a good MegaSeadramon was controlled by one of the Digimon Emperor's Dark Rings and was forced to attack the second set of Digidestined, but Cody's Digimon Submarimon destroyed the Dark Ring and freed MegaSeadramon. Later, that same MegaSeadramon brought an army of Dolphmon to help stop BlackWargreymon from destroying a Destiny Stone. However, they failed to stop him.