Shellhead

From Ben 10 Planet, the wiki resource for Ben 10!

Shellhead is one of Ben's 10,000 future Omnitrix aliens. Shellhead was first mentioned by Kenny, Ben's son, in the future. He is believed to be a turtle with the ability to hide in his shell as a means of self-defense.

Many fans think that Shellhead is an Vulpinic Torgutans, the original inhabits of the garbage planet of Vulpin, before they polluted it and died out .