Episode 11
The Build Base location has been discovered by Himika. Hiroshi, tired of repeated interventions, is irritated by Uzuki, and the ship on which Don and the others are on is swallowed by the vortex that suddenly occurred. Hiroshi that went to help encountered a mysterious object at the bottom of the lake. Suddenly, he wonder if he really belongs to humans.
Aired 14/12/1975EP 11 - Episode 11

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.