Intrigued by the mysterious, primitive, human-like creature captured on film roaming the wilds of Africa, Lord Carter organises a scientific expedition to the Dark Continent to find out if there is such a thing as a human ape. There, amid ferocious beasts and blood-thirsty cannibalistic tribes, the ambitious explorers find not one but two rare specimens: undefeated Karzan, the mighty lord of the jungle, and fierce Shiran, his untamed mate. However, capturing the wild couple is easier said than done, and before long, the white invaders get what's coming to them. Will they manage to catch savage Karzan and wild Shiran and lock them in a zoo cage?