Martin Prince, Jr. is Bart's classmate, and is Lisa's rival in intelligence. He is Nelson Muntz's favorite target for bullying and is an academically brilliant teacher's pet, and is portrayed as a stereotypical nerd. Martin is a fourth grade student at Springfield Elementary School. He is usually shown as Bart's friend due to the fact that he is occasionally seen with Bart, along with Nelson, Milhouse, and other kids. Martin is the son of Martin Sr. and Martha.
He is an academically brilliant student. He is also a teacher's pet with the stereotypical nerd enthusiasms for science fiction, role-playing games and not-so-great fashion sense. He has an IQ (Intelligence Quotient) of 216. As the class nerd, he unwittingly becomes the perfect target for ruthless bullying at Springfield Elementary School. He is a member of the Springfield band, and is often seen with a French Horn. Martin often says "Behold!", "Pick me, teacher, I'm ever so smart!" and "Excelsior!".