Forever King

The Forever King is the king of The Forever Knights,a top-secret organisation who try to steal alien technology to kill a alien `dragon`.It is unknown if the Forever King is hereditary or an elected position.

The Forever King Driscoll
The first Forever King featured in the series was the fourth season's main antagonist. This Forever King was originally a Plumber named Driscoll. However, he was thrown out of the Plumbers in disgrace when he was revealed to have been stealing alien tech for his own benefit. He later joined the Forever Knights and worked his way up the ranks, eventually becoming their leader and creating a splinter group of forever knights dedicated to get revenge on the plumbers.

Driscoll first appeared in Perfect Day where he finds Enoch trapped in a dream world. He leaves Enoch to his fate after his multiple failures and says he will take care of Ben himself. He appears again in Ben 10 vs.The Negative 10 where he rounds up a collection of Ben's old enemies to form a specialized team, in an effort to steal the Sub-Energy, the most powerful energy source on Earth and given to the Plumbers after capturing an alien convict. Driscoll eventually manages to steal it and enhances his powersuit with it,but the energy source is eaten by Upchuck. His suit is destroyed, but Driscoll survives and escapes.

The Forever King Patrick
The Forever King on Alien Force, he first appeared in the episode "Be-Knighted," giving an alien weapon to Connor that was believed to be powerful enough to slay the captive Alien Dragon, around which the entire Forever Knights Organization had been formed. Upon the failure of Connor to slay the dragon, he countered Connors claims that the Forever Knights were un-needed by stating that the world now needed them more than ever, as they now knew that there was an entire planet of dragons who may be plotting revenge.

Urian
The Forever King Urian, is another Forever King, of another faction of The Forever Knights that try to get the ancient mexican toltech battle armour. Urian appeared in "Duped", with the ability shoot electricity out of his hand, but it was confirmed by Dwayne McDuffie to simply be a gun inside his armor.

Trivia

 * They are similar to Adolf Hitler, a real-life leader of a notorious political party and paramilitary group during the 1930s and '40s, who promised to have his party to lead his country to success, but then skewed it into a criminal system.