A gigantic robot is discovered and could turn the tide for one ravaged nation.

The new robot is named Reideen and Saiga has trouble controlling it.

Saiga has gained mastery over Reideen; another threat appears while the Vigilance Corps deals with disaster.

While a new enemy threatens Saiga and his friend underground, an alien wreaks havoc above ground.

The Vigilance Corps tries to find a way to contain Reideen; an aerial beast presents new problems.

Saiga resists any type of help from the Vigilance Corps; Reideen faces a threat from the sky.