Mari Shimizu (Japanese: 清水 マリ, Hepburn: Shimizu Mari; born 7 June 1936) is a Japanese voice actress affiliated with 81 Produce. She is known for voicing the titular protagonist of the 1963 Astro Boy television series and its 1980 colour remake, Belo in Humanoid Monster Bem, and the titular protagonist of Jetter Mars.
Source: “Mari Shimizu”, English Wikipedia (CC BY-SA 4.0), excerpt