Bioids

They appeared in Ben 10 Alien Force as Vilgax's guards. The Episode they appeared in was The Final Battle parts 1 and 2. They just have a blank sphere face and a body with arms and legs. Vilgax used them to control the omnitrix for hundreds of bioids into one of the aliens of an omnitrix. Hundreds of Humungosaur's could defeat Ultimate Humungosaur.