Doctor Animo (Ben 10)

One of the few villains in Ben's Rogues Gallery to be a human. Dr. Aloysius Animo was once a brilliant veterinary, until he made genetic experiments on animals in the hope of gaining a famous medicine prize. His experiments were judged amoral, and the prize was instead given to another doctor. Unable to stand this, Animo retreated for years and went on in his experiments. Eventually, he ended up developing a device named the Trasmodulator that allowed him to transform animals into giant mutant monsters.