At some point in time, the Yenaldooshi came into the service of Zs'Skayr. He is the only ally of Ghostfreak not from a planet with Anur on the beginning, but he comes from a moon from a planet beginning with Anur.
He first appears in the episode Benwolf, when he is sent by Doctor Vicktor to steal communications equipment from a Navajo Indian reservation. Ben Tennyson, his cousin Gwen, and their grandfather Max Tennyson were visiting the reservation at the time, and encountered the Loboan. At first, it was believed he was a Navajo werewolf, hence the name it was given. Ben first fought the Yenaldooshi as Wildvine when he was bitten. When the Omnitrix timed out, the Yenaldooshi attacked Ben and inadvertently scratched the Omnitrix, causing the device to become stuck between Capture Mode and Active Mode. This caused Ben to undergo a gradual transformation into Blitzwolfer, as the DNA from the Codon Stream was unable to be used all at once. However, everyone believe that Ben was actually turning into a werewolf at the time. They tried to destroy the Yenaldooshi with a silver pendant covered in the juice of a rare cactus, but were surprised when it failed. It was only after Ben's transformation was complete and the Omnitrix symbol appeared on his stomach did they realize that they were dealing with an alien werewolf. The Yenaldooshi later seems to be killed in a cave-in during a second battle with Cannonbolt, but he survives and the device he built from the stolen communications equipment activates without the Tennysons knowing.
In The Return, the Yenaldooshi returns with his device, which is part of Zs'Skayr's plan to block out the Earth's sun. In the next episode Be Afraid of the Dark, the Yenaldooshi's transmitter explodes when Grandpa Max rams a space shuttle into Zs'Skayr's corrodium projector. It is not known whether the explosion of the corrodium transmitter killed the Yenaldooshi, or if he survived. Somehow, the Yenaldooshi was not mutated by the corrodium beam, most likely because his species and other neighboring ones have large deposits of corrodium on their home worlds.