Super Android Metalder (超人機メタルダー, Chōjinki Metarudā) is the sixth and shortest entry of the Metal Hero Series franchise, running from March 16, 1987, to January 17, 1988, for only 39 episodes.

However, the pacifistic Dr. Koga put Metalder to sleep in the Silver Caucus base and left for the United States to work for NASA.

God Neros sends out his massive armies to kill Dr. Kōga, who learned of their organization and returned to Japan to activate Metalder.

In order to give Ryusei a "purpose", Koga runs out of the Silver Caucus base, allowing Neros' troops to kill him.

He was hidden in a secret base of the Japanese Imperial Army until Dr. Koga activated him years later to fight the Neros Empire.

At the end of the series he defeats God Neros but in the process, his super-gravitational energy is severely damaged, as a result whenever he moves longer, he will explode and the world will be destroyed by its impact.

The leaders meet at the Ghost Bank, a ring of gates containing key army officers surrounding God Neros' throne.

After being killed, they tend to melt into a puddle of green slime: The Armament Army (機甲軍団, Kikō Gundan) consists of walking arsenal robots.

Silver Caucus (シルバーカークス, Shirubā Kākusu) is Metalder's secret base of operation, hidden within the Wind Caves of Fuji, underneath the ruins of the former Imperial Army's Headquarters.

When the Neros Empire drew closer to locating the Silver Caucus, Metalder relocates a portion of the base at another cave with Springer.

Metal Charger (メタルチャージャー, Metaru Chājā) is a transforming, four-wheel flying car based on a sixth-generation Mazda Familia that Metalder drives.

Dester X1 (デスターX1, Desutā Ekkusu Wan) is an advanced military machine tested by the Armament Army during a demonstration to potential buyers.