Mashin Hero Wataru (魔神英雄伝ワタル,Mashin Eiyuuden Wataru) is a Japanese anime television series co-produced by Sunrise and Red Entertainment and the first instalment of its franchise of the same name. It aired on Nippon TV from April 15, 1988 to March 31, 1989.
Wataru Ikusabe was just a regular 9-year-old boy who was transported to an alternate world by a mythical dragon in the town's lake. Arrived, Wataru learns he is the chosen savior to save that magical realm by restoring the rainbow of a seven-pillar mountain from an evil demonic ruler. In his quest to save the realm, Wataru goes through challenges and quests to "somewhat autonomous and small" super robot battles called "Mashins" in which his is the merge of his clay sculpture and the lake dragon from his world. What's more, he becomes friends with many natives of the world and cooperates with them.