The Bacteria Corps

The Bacteria Corps ("Saikin butai" 細菌部隊) is an episode of the 1963 Astro Boy anime series.

Synopsis
The pilot of a rocket that has made an emergency landing is suffering from a strange disease. After they hear a voice from within the pilot's body, Astro and Higeoyaji are reduced to tiny figures, and get into the body. Inside, they see bacteria-sized aliens.

Characters
In Order of Appearance: