|“||Don't you remember? Your ape-like incompetence drove my father insane!||„|
|~ Frank Grimes Jr. to Homer.|
Frank Grimes Jr. is the main antagonist of the 2002 The Simpsons episode "The Great Louse Detective". He was the son of Frank Grimes and an enemy of Homer Simpson who wants to avenge his father.
Like his father and other characters in the show, he was voiced by Hank Azaria.
After Homer Simpson is subject to several murder attempts, Sideshow Bob is roped in to help him find the perpetrator, who is revealed to be Junior, Homer's mechanic. No one knew of his true lineage until he revealed it to them upon being cornered, he is Frank Grimes Jr., the illegitimate child of Frank Grimes, Homer's old power plant co-worker from the episode "Homer's Enemy".
His dad liked hookers, and one of them gave birth to him. The real reason behind his intent to kill Homer was because he believed that Homer killed his father by driving him insane when Grimes Sr. accidentally killed himself by electrocuting himself while imitating Homer. He also becomes more infuriated in each passing moment he shares with Homer, just like his father. He has yet to reappear in future episodes.
In the story in Simpsons Comics #108, Homer was framed by Mr. Burns for dealing nuclear weapons and arrested. He was cellmates with Sideshow Bob, and they escaped from jail by going through a tunnel in a cell occupied by a masked prisoner. The three fell into Mr. Burns' secret lair, where the mysterious prisoner was revealed to be Grimes. Sideshow Bob then fell on him and both were knocked unconscious. Homer was cleared of his charges while Bob and Grimes were taken back to prison.