Negative 10

A group of Ben's worst villains who are trying to obtain the Sub-Energy. Made up of:

Forever King of the Forever Knights
Forever Knight Ninja (a devoted servant of the King skilled in combat)
Doctor Aloysius Animo (with his new creations, a mutated bat and a mutated gopher)
The Circus Freak Trio (Acid Breath, Frightwig and Thumbskull)
Joey/Rojo (who has been given a new suit of alien tech by the Forever Knights)
Clancy (who has devolved into a mutant insect that sort of resembles Stinkfly since his last encounter with Ben)
Charmcaster (without Hex)
Sublimino (being the new leader of the Circus Freaks)