For the Fleischer/Famous cartoons, Clark Kent was voiced by Bud Collyer. However, at the end of "The Mummy Strikes", Clark's voice is noticeably deeper than usual and just different overall. Clark's diffrrent voice also appears in "The Undergtound World" and his one line in "Secret Agent". Does anyone have any information regarding this voice change? This is a topic that has likely never been brought up since I can't find any info on it.