Mettaton EX is a flamboyant, humanoid robot and a major character in the game Undertale. Originally created as a simple rectangular robot by Dr. Alphys, Mettaton later upgrades into his EX form, becoming a charismatic TV star. He hosts various shows in the Underground and serves as one of the main antagonists in the Neutral and True Pacifist routes. Mettaton EX is known for his dramatic personality, love of the spotlight, and memorable musical battle.