Dagon (Ben 10)

Dagon is an interdimensional demonic entity.

Biology
In his true form, Dagon appears as a giant green octopus-like creature. In the legend of Saint George and the Dragon, Dagon took the form of a black-scaled western dragon with a green belly and wings. When he fought against Ultimate Way Big, Dagon took on a form similar to his true form but with a more serpentine-looking body.

Appearances

 * Ben 10: Ultimate Alien, s03e42, "A Knight To Remember" (2011)