In the "Sonic the Hedgehog" film series, Dr. Ivo Robotnik, known as Eggman, is the main antagonist whose eccentric personality, genius-level intellect, and larger-than-life ambitions make him a memorable and complex character. Played by Jim Carrey, Eggman is a fascinating portrayal of a mad scientist, blending humor, intensity, and a deep sense of rivalry toward Sonic into a larger-than-life persona that has become one of the most iconic film villains.