Ultimos

Ultimos is the leader of the Galactic Enforcers and the most powerful hero on the planet T-K. At this time there is very little information about him. He is the Specimen Prime. He first appears in The Galactic Enforcers.

Abilities
His primary powers are superhuman strength and durability, flight, heat vision, and ice breath. He is very similar to Superman in terms of his powers, appearance and attitude. He lost his powers in the Ben 10: Alien Force episode, Vengeance of Vilgax: Part 1 because of Vilgax. In Ben 10,000, he seems to have gained his powers back, but it may be an alternate future.

Weakness
Ultimos' "Kryptonite" is chocolate, because it weakens and shrivels him, turns his skin to brown/gray, makes him cold, makes him shiver and makes him collapse, when eaten.

Original Series
Ultimos showed up in The Galactic Enforcers to help Ben Defeat Sixsix.

Alien Force
Ultimos lost his powers to Vilgax after he was defeated by the latter. It is possible that Ultimos, Tini, and Synaptak died after losing their powers.