Yeti

A Yeti first appeared in episode Escape From Aggregor, where Dr. Animo has been controlling him by a mind control headband and putting him against a fight with Four Arms. Later, Brainstorm gains control over the Yeti and frees him from the mind controlling headband. The Yeti is shown to possess vast strength as it beat Four Arms without much effort.

When Dr. Animo reveals his plan to turn everyone into Yetis by using a special machine he invents within its radius, it briefly assumes control of itself and stares in shock at Dr Animo, as it, like Ben, Kevin and Gwen, thinks the plan is very stupid.

Ben 10: Ultimate Alien

 * Escape From Aggregor (first appearance)

Trivia

 * The hair in his head resembles the hair style of Dr. Animo.