1970 Japanese movie

Spectreman, on an assignment from the Overlord, assumes the earth name 'George' and starts working the Pollution Research & Control Squad. Dr. Gori quickly creates 'Hedron' out of the earth to pollute & attack the earth cities. In a vicious battle, Spectreman defeats Hedron, the gas breathing monster. But - the evil genius Dr. Gori revives Hedron and it continues its attacks on earth. A young boy discovers Spectreman's secret identity and helps Spectreman to regain his strength and defeat Hedron once and for all!