Subtitle: Planet Gross President (グロース星総統)
Gross Go-Ne did not make any physical appearance in the show and was not defeated. His daughter and his aide fused to form Demon Go-Ne. His voice was heard in the final episode after the death of Demon Go-Ne, saying "We'll surely get the Earth one day...for sure!" (我々は、いつか必ず地球を手に入れて見せる…必ず Wareware wa, itsu ka kanarazu chikyū o te ni irete miseru… kanarazu! ).
- The existence of such a character was generally unrecognized until the publication of the book "Magnificent Tsuburaya special effects design world Mirrorman ☆ Jumborg Ace Yoshiaki Yoneya design work 1971 ~ 1973".