First, he performs a henshin (transforming) pose (crossing his arms in front of his chest) and uttering the phrase, "Gōriki Shōrai" (剛力招来, literally "Summon Mighty Power"), he is wrapped in a blue cocoon, which bursts, revealing the creature Sanagiman (サナギマン).
He is a moth-like mutant wearing the same power belt as Sanagiman and resembles a blue humanoid with huge colorful oval eyes, prominent lightning-shaped antennas, black gloves and boots, yellow lightning-shaped marks that stream down his body, and a yellow scarf he can transform into various weapons, including a whip-like chain.
Goro is a member of the Youth League (少年同盟, Shōnen Dōmei), a Science Patrol-style group of similarly psychic-powered young people, and has a telepathic link with the sentient flying car Raijingo (ライジンゴー, Raijingō) which can fire missiles and bite bad guys with the teeth built into its mouth-like grill ("Raijin" is the Japanese god of thunder).
Inazuman (イナズマン) was produced by Toei Company Ltd. and broadcast on NET (now TV Asahi) from October 2, 1973 to March 26, 1974, with a total of 25 episodes.
The entire 48-episode series was broadcast (with English subtitles) on KIKU-TV in Honolulu, Hawaii in the mid-1970s, during the height of the popularity of tokusatsu programs ignited by the success of Kikaider in 1974.
A direct and darker continuation of the first series, a new enemy emerges in the evil robots of the Despar Army (デスパー軍団, Desupā Gundan) led by Führer Geisel (ガイゼル総統, Gaizeru Sōtō).