Disguised as a human being (Jôji 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 cybernetic being 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:
▪ Spectre-Flash - Spectreman's ultimate weapon, an energy beam he shoots from his hands or wrists (depending on the pose he performs with his hands).
▪ Shuriken - Multicolored shuriken, which he pulls from his beltbuckle.
▪ Spectre-Blades - Razor-sharp blades that spring forth from Spectreman's forearms (a possible inspiration to those of the Guyver).
▪ Spectre-Sword & Shield - Sword and shield sent to Spectreman from Nebula Star when requesting them.
▪ Spectre-Gun - A huge gun sent to Spectreman from Nebula Star when requesting them.
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.