Carl Nesmith, also known as Captain Nemesis and later known as Overlord, is a villain in Ben 10: Ultimate Alien, and Ben 10: Omniverse. He is a former superhero who became a supervillain and try to destroy Ben Tennyson so he can became famous again.
Carl Nesmith was a hero along time ago, According to himself, He was a hero before Ben was born, He became a famous superhero and a great American icon as it was mentioned by most characters. According to himself, He was more famous than Jennifer Nocturne, Carl Nesmith also became rich.
Carl Nesmith appear to be arrogant, He enjoy the fame and glory more than helping people.
He become jealous of Ben Tennyson being famous and getting the attention.
He is a psychopath and power hungry.