Maurice LaMarche.

Maurice LaMarche (born March 30, 1958) is a Canadian voice actor and former stand-up comedian. He is best known for his voicework in Futurama as Zapp Brannigan's beleaguered assistant Kif Kroker, melodramatic soap acting robot Calculon and other characters; The Brain in Animaniacs and Pinky And The Brain, and Egon Spengler on The Real Ghostbusters and Extreme Ghostbusters.

In the 1987 series, Maurice LaMarche voiced Chronos in the episode "Split-Second". In the 2012 series, he voices Attila the Frog and Rasputin the Mad Frog.

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