Who ever expected to see thousands of people singing "The Old Rugged Cross" in a planet-wide flying traffic jam? What impact did that moment have in a story that's all about the limitations of faith? And where does your humble host wish the lesson of "Gridlock" would be learned?
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Well done–it's a very tricky episode, and I've had several lengthy debates about it. One can almost wonder if, without the power of religion, whether there would have been any civilization left to save when the Doctor showed up.