resemblance to the Marvel version, the staff at Marvel Comics, including Spider-Man's co-creator Stan Lee, praised the show for its special effects and stunt work, especially the spider-like movement of the character himself. While it is said that Marvel initially opposed the addition of Leopardon, the robot was viewed as a necessary gimmick to attract younger viewers and was ultimately kept. The show's mechanical designer, Katsushi Murakami (a toy designer at the time), expressed concern about Toei's capability to market Spider-Man to Japanese audiences and was given permission by producer Yoshinori Watanabe to take whatever liberties he deemed necessary. Murakami came up with the idea of giving Spider-Man an extraterrestrial origin, as well as a spider-like spacecraft that could transform into a giant robot (due to the popularity of the giant robot shows in Japan at the time). The action figure version of Leopardon was initially sold as a part of the Chogokin toyline and became an unprecedented success in the market, which contributed to the TV series' popularity as well. The success of the show made Toei introduce the giant robot concept to their Super Sentai franchise in Battle Fever J (a show which they also co-produced with Marvel) and contributed to Spider-Man's popularity when Marvel began to export more of their properties to Japan during later years. The head writer of the series was Shozo Uehara (Gorenger, JAKQ, The Return of Ultraman), who wrote 15 episodes, while Uehara’s Sentai collaborator Susumu Takaku (who was head writer of the show alongside Uehara) wrote 15 episodes and the movie. There were many episodes in which the "monster of the week" (usually a "Machine BEM" created by the villain) was not relevant to the plot, as well as two episodes (ep. 12 and ep. 27) which featured no monsters at all. The show also featured a story arc in which the female antagonist Amazoness tries to uncover Spider-Man's secret identity. Rather infamously, every time Spider-Man's giant robot finished a monster, it always used the exact same shot only with a new monster composited in, but due to the nature of the splice, the very first monster of the series was always visible very briefly before exploding. This occurred because at some point during filming of the series, the Leopardon suit was stolen from the set; Toei could not afford to make a replacement and opted to splice the existing footage into