A professor aims to prove the Darwinian theory correct with a wild beast brought up in the jungles. The creature, named Darwa, is taken to civilization where society accepts her as a woman and a young aristocrat falls in love with her. As the creature is not a woman, but rather the result of experimentation and only half human, the professor declares the project a success. But will it hold up to the final test when Darwa is pitted against a wild ape?