The invisible plane was Diana’s major means of travel during the Golden and Silver ages as the character did not have the ability of flight. It was controlled telepathically and would appear almost instantly. With the introduction of the power of flight to the character it was a forgotten element of her character until she found the Lansinar Disk. This disc was a piece of alien technology which allowed her to create an invisible version of whatever object or vehicle she visualized it to be. She would use this to create an invisible plane, but it eventually became to be used more to create the Wonder Dome.
An iron-fisted general of the German Army during World War I. Huston described Ludendorff as a "pragmatist, realist, patriotic, fighting for his country", further explaining, "he lost his son on the German front lines and was just quite tortured, diabolical, stubborn and believes that what he's doing is for the betterment of mankind." On his character, Huston said, "Ludendorff is a believer that war is a natural habitat for humans." Huston stated the film as an anti-war film and "somebody like Ludendorff would probably think that the idea that love conquers all is quite a naive concept. But finally it's true and sometimes the best way to examine mankind is from another perspective." On the genre of the film, Huston said, "It's Greek mythology. It's the origin of story and sometimes we need demigods to look at us to understand what our weaknesses are. It serves the mythological world."