<Tr> <Th_colspan="2"> First appearance </Th> </Tr> <Tr> <Th> The Simpsons </Th> <Td> "Bart the General" </Td> </Tr> <P> Nelson Mandela Muntz is a fictional character and the lead school bully from the animated TV series The Simpsons, best known for his signature mocking laugh "Ha - ha!". He is voiced by Nancy Cartwright . Nelson was introduced in Season 1's "Bart the General" as an antagonist but later turned into an on - and - off friend of Bart Simpson . </P> <P> Nelson is a student and bully at Springfield Elementary School . He is known to have terrorized virtually every kid in Springfield at one point or another . Most often, however, it is the school nerds and less popular students, such as Milhouse and Martin, who are the subject of his cruelty . Nelson shows the occasional glimpse of humanity, though, and other characters have occasionally warmed to him; Lisa dates him briefly in "Lisa's Date with Density", Marge informally adopts him in "Sleeping with the Enemy", and Bart is shown as a friend to him several times, such as in "The Haw - Hawed Couple". </P>

What is the bullys name on the simpsons