Crude, but Effective: Stephen Gallagher writes "when your resources are meagre then your audience will compensate with their own imagination."That, I believe, was the true secret of the show's success. There never was a poorer theatre than the screen fare available to a science fiction fan, back in the days before screen sf was a universal commodity. A cardboard robot, a spaceship on a visible wire... these were the agents of awe. The point of it was that you looked past the flaws in the presentation and responded to the vision behind them."