William Theodore "Billy" Billions is a villain in Ben 10.

[Terrane]

William Theodore "Billy" Billions is a villain in Ben 10.

Billy has brown eyes, tanned skin and black hair. He wears a red-violet tux and a pink bow tie, a tux with gold buttons at the end of his black sleeves, gold pockets, a white shirt under his tuxedo, a gold medal, and black shorts. 

Billy is virtually identical personality wise to his original counterpart. The only key difference is Billy's arrogance comes from his obsession with getting everything he wants. However, it is revealed that he just wants friends that don't just like him for his money. He befriended Ben and Gwen, but after the Forgeti made them forget, Billy doesn't remember and returns to his old ways. In Roundabout: Part 2, Billy shows a more sadistic, power-hungry, and murderous side to his personality, conveying that he desires to be Forever Knight's main assistant and hoping to please him by killing Phil Billings.

Billy first appears in Rustbucket RIP. He is seen driving his vehicle from the back seat towards the store where the Platinum Card is. However, XLR8 buys the card before him, much for Billy's anger. In response, Billy steals the Rustbucket, but Wildvine chases him. He is ultimately defeated by Heatblast and grounded by his parents. After getting only a half of the card, Billy swears revenge on Ben.

In Don't Laze Me, Bro, Mr. Billions rented out Lazer Town for the whole day for Billy's birthday. Ben and Gwen were planning to go to Lazer Town that day, so they decided to challenge Billy and his "friends" to a laser tag duel. It turned out that Billy's "friends" were actually robots that Mr. Billions owned. Ben used his alien powers in an attempt to beat Billy while Billy used his robots. Billy was being extremely rude to his robots, making them rise against all humans, and the robots set their lasers to disintegrate. Billy and Gwen used Billy's presents (that were made of real gold) to deflect the lasers, while Ben used Diamondhead to target the lazers to all the robots. The laser tag duel ended in a tie.