Green Splotches

A scientific expedition in South America is captured by super-intelligent plants from another planet who travel in a flying saucer at the speed of light! Written in 1920, the story was "modernized and adapted for radio" by William N. Robson.

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A team of scientists ventures into the forbidden Valley of the Infernal River despite being told to stay away, where they discover advanced aliens who are hunting and collecting specimens just like them.