Former Guns n' Roses guitarist Buckethead, a big fan of the TV series, has made several references to it within his music career. This includes naming both his 1994 LP album and his early band "Giant Robot" after the titular character. He often plays a rendition of the TV series' theme song during his live shows and also shows stock footage from the TV series in the background of some of his live shows on a large screen behind him, if the venue that he is performing in is capable of doing so.
Both Emperor Guillotine and the rest of the villains and the supporting cast were not Mitsuteru Yokoyama's creations and so they could not be used at all in the later seven-episode anime TV miniseries "Giant Robo: The Day the Earth Stood Still".