Frank Grimes, Jr.

Frank Grimes Jr. is the son of Frank Grimes. He was born because his dad "happened to like hookers". He was Homer's mechanic. However, when he found out Homer was behind his father's death, he decided to kill Homer. But after his first attempt on Homer's life, the Simpsons and the police hired Sideshow Bob to protect him, on the principle of 'sending a homicidal maniac to catch a homicidal maniac'. After a 2nd try, Grimes entered many cards with Homer's name on them into the Mardi Gras King election. When Homer was elected King, Grimes sabotaged the parade float on which he was to ride in. At the last minute, Bob saved Homer after realizing the truth. The two cornered Grimes, who admitted the truth and was arrested by police. He appeared in The Great Louse Detective.