Black Jack is a man with god-like surgical skills. Little is known about this mysterious, unlicensed physician aside from his immense talent, which is legendary amongst the medical community; but should you require the services of this genius, you must be prepared for a hefty price tag! Though he often appears to have the demeanour of a businessman more than a doctor, Black Jack is not entirely cold-hearted; and with the help of his assistant Pinoko, he will do all in his power to save his patients, no matter how obscure, difficult or unknown the ailment. However, even a man of science like Black Jack can be surprised by the medical mysteries that nature throws at him, and sometimes even by the sheer tenacity of human nature itself.
After a horrific car crash, Dr Tenma lost his beloved son Tobio. Out of grief, he built a robotic son named Astro as a replacement; but soon after, Dr Tenma had the boy deactivated and put into a deep sleep. In the present, the scientist Dr O'Shea finds Astro and risks everything to reactivate him, train him to be a hero of justice, and raise him to be a functioning member of society. Amidst the prejudice of humanity, the pacifistic Astro will promote peace, battle the forces of injustice, and attempt to bridge the gap between humans and machines.
Both of these are episodic nature, making them very easy to watch. The art style is similar (as in you can easily tell good people bad). Also, there's alot of character crossovers from Tezuka's other works in both animes.