Spectreman

Spectreman (スペクトルマン, Supekutoruman^?) is a science fiction tokusatsu TV series produced by P Productions and created by producer Souji Ushio. The series aired on Fuji TV from January 2, 1971 to March 25, 1972 with a total of 63 episodes (divided into three segments), not counting the pre-series pilot episode. This was the first major superhero show of the 1970s.

Disguised as a human being (Jôji "George" Gamô), Spectreman requests his transformation from the Nebula Star, or is ordered by same to do so. Saying "Ryôkai" (了解 - Japanese for "Roger"), or "Ready" in the US version, he raises his right hand towards the Nebula Star, which shoots a beam at him, transforming into Spectreman, a cyborg in a gold-and-copper cuirass, with a full helmet looking somewhat like the Rocketeer's mask. Before transforming back into a human, however, he simply faints, possibly from using up his energy.

Spectreman starts out as human-sized, and can increase his size at will.

Spectreman's weapons included:

While Spectreman is virtually invincible, he can still be damaged. In one episode, when injured in the leg by an opposing monster, he bled green blood. He bled one other time, when bitten in the neck by a space vampire. Notably, his blood color had changed to bright yellow.

Banished from the peaceful simian Planet E, the mad scientist Dr. Gori and his brutish assistant Karras [Lla in the Japanese version] search for a new planet to rule after Gori's plot to conquer Planet E had been foiled by its government. Coming across the Earth, Gori is captivated by its beauty but appalled by its inhabitants' misuse of its environment, leading to severe pollution (a huge topic back when this series was made, since Tokyo was the most polluted city in the world at the time), so humankind must be quickly conquered if this planet is to be inhabitable. He plots to, ironically, use the pollution that's plaguing Earth to create horrible, giant, rampaging monsters to wipe out and/or enslave humankind.

Hope comes in the form of the Nebula 71 Star, a Saturn-like artificial satellite that observes the Earth incognito. Fearing that Gori may eventually make the Earth uninhabitable, they dispatch Spectreman, their super-cyborg agent, to battle the menace of the mad apeman. Spectreman disguises himself as a Japanese man named Jôji Gamô to walk among the humans and scout out Gori's weekly menace for the Nebula 71 Star. He works with a government-run group called the Pollution G-Men, run by Chief Kurata. This group investigates phenomena involving pollution, but they don't (until late in the show's run) have the facilities to handle giant monsters, so unbeknownst to them, their comical-yet-mysterious teammate Jòji disappears on them, only to help them as Spectreman!

...
Wikipedia