R&B superstar Mariah Carey is set to test her acting chops by voicing a "redneck animal handler" in an upcoming episode of TV cartoon American Dad. The singer will show off her accent abilities in a forthcoming episode of the animated comedy, created by Seth MacFarlane, according to bosses at U.S. network Fox. Ashton Kutcher has also been lined up to lend his voice to a character on the upcoming season of MacFarlane's other hit series Family Guy, while Daniel Radcliffe will return to The Simpsons to play a strange older boy encountered by Bart. Actresses Elisabeth Moss, Kristen Wiig and Eva Longoria have also signed up to voice characters in The Simpsons' 25th season, with the Mad Men star portraying a mother who names her baby after hapless dad Homer when he delivers the tot. Bridesmaids comedienne Wiig will voice an agent for America's Federal Bureau of Investigation in the premiere episode, which will air on 29 September (13) in the U.S.