The adventures of Leo, a young lion cub who becomes king of the jungle when his father, the previous king of the jungle is killed by a human hunter.

In 2030 AD, after being abandoned by his creator, a young boy robot is rescued by an Android Advocate, Dr Elefun, who adopts him as his own and guides him in the use of his special powers to aid and protect mankind and robot-kind.

Astro is a robotic boy created by Dr. Tenma to replace his late son. When Tenma destroys his laboratory and shuts down Astro, the Ministry of Science revives him and tries to give him a normal life as a 6th-grade student who occasionally helps keep renegade robots from causing harm.