During a trip to Washington D.C., Ben confronts Dr. Animo, a disgruntled scientist whose Transmodulator can mutate living animals, and even resurrect dead ones, and eventually learns a lesson about what being a hero really means. :Aliens Transformed into (In order) Heatblast, Grey Matter, Four Arms, and Stinkfly.
Dr. animo in the ben 10 series also appeared in many Ben ten game sets as action figures. Animo returned for a couple more episodes in the series with a whole host of mutated creature for Ben ten to battle. As a whole the cartoons between ben 10 and Dr. Animo were some of the most classic. Not too many subplots. Just ben ten having to fight his hardest to defeat a very strong villain.
Fans of the show loved watching the Dr. animo cartoons because of the classic fighting and simple plot lines abd the variety of aliens from both sides. Plus, Animo was no pushover for ben to beat.
