Ghostfreak

Ghostfreak is an ectonurite one of Ben's aliens who's DNA was taken from Zs'Skayr, the High Ecto-Lord of the Ectonurite homeworld of Anur Phaetos, who existed in the Omnitrix due to Ectonurites having the ability for their mind to exist in even in the smallest strand of their DNA. Ghostfreak's original appearance was similar to that of a ghost with only one eye and a black track along his skin but after freeing himself, he tore off the second skin to reveal his true horrifying form. He has the power to phase through matter and possess humans by going into them and controlling them. He also has telekinesis over beings he possesses and becomes far stronger if he's in complete darkness, which allows him to become even scarier in appearance and fire a powerful energy beam from his chest. However, his weakness is that he needs the Omnitrix to become whole again, and without it sunlight can cause him to combust and die.

In "Ghostfreaked Out", was reveled that Zs'Skayr's mind mind lay within the DNA sample of Ghostfreak, and he finally manages to force his way out of the Omnitrix, showing his true form, he is bigger, with a skull face turned down, sharp claws, and ghost tail with stripes.

In Ben 10: Alien Force, Ghostfreak reappeared in "Ghost Town", when Ben absorbed Zs'Skayr, using the DNA absorb method of escaped Omnitrix aliens he used on "Vengeance of Vilgax", but with Ghostfreak's true form, though moment of transforming Ghostfreak quickly regained control of Ben, but with the help of Vilgax, Ben took control and transformed back.