Wes Green

Wes Green is an old friend of Grandpa Max and also a retired Plumber, that lives in New Mexico. He has a granddaughter, Kai and knows much about Navajo werewolves. He only appears in the episode, Benwolf, where everyone thinks that Ben have transformed into a werewolf since he was bitten by one. Although in reality, an alien werewolf scratched the Omnitrix, while the Omnitrix collected its DNA and obtains a new alien, Benwolf.

Ben 10: Ultimate Alien

 * Benwolf (first appearance)

Trivia

 * In the enhanced version of Benwolf, it was revealed that he and Max sent a Yeti back to its dimension.