Storytellers Gene Roddenberry, Irwin Allen, and Rod Serling created the storylines and characters behind the best-loved futuristic television of their time. But as Roddenberry’s Star Trek competed for ratings with Allen’s Lost in Space, each show’s creator aimed for a very different direction. This episode explores how Roddenberry and Serling (of The Twilight Zone) used the future as a stage for modern morality plays, and William Shatner, Leonard Nimoy, Nichelle Nichols and other science-fiction stars describe how they prepared to interact on-camera with a malevolent alien force...or, perhaps, a giant radish.