achieve his goal. He was the main antagonist of season four. Enoch – One of the leaders of the Forever Knights, though he mostly works behind the scenes and rarely directly battles the Tennysons. At the end of "Perfect Day" he becomes trapped in his own dream machine and is replaced by the Forever King. Dr. Aloysius James Animo – A promising veterinary scientist whose career was cut short when he was discovered performing twisted genetic experiments on mutating animals. He had hoped that his research would win him the Verties Award. Because of the nature of his research, he lost the award to another doctor named Kelly. This drove him insane, and he dropped off the map for five years until he could perfect his research. After being defeated by Ben for the first time, Dr. Animo makes himself a personal nemesis to the boy, always hoping to defeat him and rule the world. His powers include controlling mutant animals, reviving them and creating them. He is Ben's tertiary archenemy. Hex – A self-proclaimed master magician and sorcerer from the inter-dimensional world of Ledgerdomain. Charmcaster – Hex's gifted 15-year-old niece, who at first appears loyal to her uncle but was actually using him to get power for herself. She later attempts to use a spell to swap bodies with Ben in order to gain possession of the Omnitrix only to switch with Gwen by mistake and be foiled, and have her spell book stolen by Gwen. She later becomes a member of the Negative 10 to get revenge on the Tennysons, though her grudge is mainly against Gwen. Her powers include mana manipulation and spellcasting. She is Gwen's archenemy. Voice cast Main Tara Strong Ben Tennyson, Upgrade, Blitzwolfer, Buzzshock, Gwendolyn Tennyson (future), Mrs. Fang, Edith, Lucy Mann, Ken Tennyson, Sandra Tennyson Meagan Smith Gwen Tennyson Paul Eiding Max "Grandpa Max" Tennyson Steve Blum Vilgax, Heatblast, Ripjaws, Ghostfreak, Four Arms (4-year-old), Heat Jaws (fusion of Heatblast & Ripjaws), Zs'Skayr, Mr. Mann, Roger, Edward White, Steve Cummings, Bob Dee Bradley Baker Wildmutt, Stinkfly, Eye Guy, Spitter, Stink Arms (fusion of Stinkfly & Four Arms), Carl Tennyson, Huge Limax, Mutant Frog, Mutant Cockatiel, Joe, Acid Breath, Stone Creatures, SixSix, Porcupine, Immovable Object, Mr. Zu, Interpreter Alien, Drones, Elsgood (Old), Joel Tennyson, Camille's Ex-Boyfriend, Scooter (in "A Change of Face"), Amazing Alan Jim Ward Diamondhead, XLR8, Wildvine, Diamond Matter (Fusion of Diamondhead &