Episode 23
Mimashi occupied Mayumi's ferry, and Mayumi and the others were trapped in the hold. Mimashi threatens to blow up the ferry with all the passengers if Hiroshi doesn't hand over the dotaku within an hour.
Aired 07/03/1976EP 23 - Episode 23

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.