Voice by Christopher Miller. Mr. Butlertron's voice is extremely metallic and monotonous, and he usually only has two intonations: a regular robotic voice, and a slightly deeper variant he uses at the end of sentences. He will often speak in his regular voice and then switch to his deeper voice at the end to call whoever he's addressing "Wesley". One exception to this is in Escape to Beer Mountain: A Rope of Sand when he uses a higher than normal intonation, seen again in Makeover, Makeover, Makeover: The Makeover Episode .