Metalseadramon (voiced by Doug Erholtz) is A Mega-Level, Data Type Sea Serpent Digimon and on of The Dark Masters. He rules all the waters of the Digital World when it became Spiral Mountain. He defeated Whamon who helped the Digidestined escaped but was defeated in the end by Wargreymon.
- Metalseadramon is the only Digimon in the Dark Masters to wear armor that doesn't rust.
- Metalseadramon will be a recurring enemy for Aaron's Adventures.