Sideshow Bob is a fictional character from the animated television series The Simpsons. He is known for his tall, curly hair, sophisticated demeanor, and a deep voice, often provided by actor Kelsey Grammer. Originally introduced as a sidekick to Krusty the Clown, Bob later becomes a recurring antagonist, frequently plotting against the show's main character, Bart Simpson. Bob is characterized by his intelligence and elaborate schemes, often involving elaborate plans for revenge. Despite his villainous nature, he is portrayed with a sense of humor and a love for culture, often quoting literature and opera. His complex personality makes him one of the show's most memorable characters.