Guernica

Adventure On Mars ("Gerunika" ゲルニカ) - English dub titled as "One Million Mammoth Snails" - is an episode of the 1963 Astro Boy anime series.

Synopsis
Astro Boy and Professor Ochanomizu investigate the disappearances of campers and mountaineers in the ice mountains, and discover a scientist who unleashes a swarm of snails on the world.

Characters
In Order of Appearance: