The four heroes which find themselves in Emi's dimension are based on the top four hero shows by Tatsunoko Production, thus making this a crossover of sorts. These heroes are identified as: Takeshi Yoroi: a young detective possessing a high-tech helmet which allows him to transform into one of five different vehicles at a time (from Hurricane Polimar (1974)). Jouji Minami: a human astronaut sworn to protect a space colony (from Tekkaman, the Space Knight (1975)). Ken Washio: the oldest of four orphans trained in ninjutsu and science weapons to defend the Earth (from ).