Character » Gwen Tennyson appears in 59 issues.
An evil Osmosian warlord and one of Ben's most dangerous enemies who was after omnipotence.
A disgruntled former assistant of Azmuth who tried to take the Omnitrix away from Ben Tennyson. An accident has left him permanently trapped in human form much to his disgust.
Charmcaster is a human from another dimension and a former enemy of Ben 10.
Dr. James Aloysius Animo is a twisted genetic scientist who creates mutated forms of animals and is a common villain to Ben 10.
Hex is a master magician and an enemy of Gwen Tennyson, along with her cousin, Ben.
Kevin Ethan Levin is the former villain known as Kevin 11 and is the now best friend to Ben and boyfriend to Gwen. He is a human-Osmosian hybrid with the ability to absorb matter and any type of energy and release it at will.
Vilgax is the main antagonist in the Ben 10 series. Vilgax is an intergalactic alien. Vilgax The Conqueror is an intergalactic tyrant and the archnemesis of Ben 10.
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