Gordon Kent is on trial for allegedly killing a scientist in an underground cavern. Desperately, he tries to explain what they found inside the cave, and the the implications for the future of mankind.
A crystal egg reveals live tableaux of the planet Mars. A 19th Century scientist is obsessed with investigating the crystal, but the antique shop owner who came across the seemingly worthless glass hopes to sell it ASAP to a tall, insistent stranger, for whom no price is too dear. The delay while the scientist experiments on the egg makes the buyer even more desperate.