The Escape Taiyô no ko Esuteban : Season 1 Episode 30

Using their advanced technology, the Olmecs are able to collect energy from the heat of the sun, and from deep inside the Earth. They capture Esteban, Tao and Zia, intent on transplanting their cells to regenerate their elders, so they can become young again. With Mendoza's help, the children manage to escape.