Ep. 49: Dr. Hanabusa becomes invisible after rival sabotages his experimental transmitter during testing.
Aired on December 3, 1963

49
Dr. Hanabusa creates an electrical transmitter designed for substances. He enters the machine to conduct a test, but his rival scientist interferes by breaking the device. This accident causes Dr. Hanabusa to become invisible. Astro Boy attempts to rescue the doctor from this dangerous situation. The story focuses on the immediate consequences of the sabotage and the effort to restore the scientist's visibility. The narrative highlights the conflict between the two researchers and the intervention of the robotic hero to prevent further harm.
Episodes
- Ep. 45 · Conspirators seize the necklace while Astro Boy opposes Cleopatra's world conquest
- Ep. 46 · Astro Boy retrieves the stolen Lever Robot spaceship while losing his energy.
- Ep. 47 · Ham egg trades an Earth pig for the alien Pork's massive crab
- Ep. 48 · Nuu from the Tenma Tribe arrives in the city causing chaos and gang plots
- Ep. 49 · Dr. Hanabusa becomes invisible after rival sabotages his experimental transmitter during testing.
- Ep. 50 · Astro Boy and Higeoyaji travel west to find the missing Hekku
- Ep. 51 · Robot Elephant Zora Malfunctions and Escapes into the Jungle
- Ep. 52 · An alien from Planet Regel brings a snow lion to Earth before cosmic snow drains the planet's energy.
- Ep. 53 · Uran discovers a photograph on New Year's Eve 1963, prompting Astro Boy and Dr. Ochanomizu to investigate the past.