Episode 38
Amasso returned a boy's fossil to a human form with magical power. He sent him to the museum where the mammoth fossils, he once had as good friend, is enshrined. The boy shoots fire arrows and the mammoth fossil becomes a Haniwa phantom mammo who starts a rampage. People panic and run away. Hiroshi is hesitant to fight against the boy who is not originally an enemy.
Aired 04/07/1976EP 38 - Episode 38

Koutetsu Jeeg
Hiroshi Shiba is an outstanding car racer whose father is assassinated upon the discovery of the Bronze Bell from an ancient civilization. This Bronze Bell is coveted by Queen Himika who comes from that ancient era; the Yamatai Kingdom, and whose ambitions are to seize the Bell and dominate earth.
Hiroshi is left with a few items from his father which would enable him to morph into a full sized mecha warrior, the Steel Jeeg. With these abilities and the help of his father's brain implanted in a computer and his assistance Miwa "Micchi" Uzuki, they set out to neutralize Himika's plans of world dominion.