Kristen Wiig, Zach Galifianakis, Rachel Maddow and Daniel Radcliffe are among the celebrities lending their voices to a new season of "The Simpsons" this fall on Fox.
Wiig will be heard in the animated show's season premiere on Sept. 29, voicing a high-strung FBI agent whom Lisa enlists for help when she suspects that something sinister has happened to Homer.
Elizabeth Moss of "Mad Men" plays a grateful mom who names her baby after Homer when he helps deliver the child.
Marvel Comics writer Stan Lee, producer Judd Apatow and Will Arnett of "Arrested Development" are among other stars voicing parts on "The Simpsons."
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