While researching hatchling amphibians by the shores of the lake, Jane and Roger discover that the water level is dropping radically, without explanation. Meanwhile, on the other side of the lake, Lex Monroe (just out of prison after attempting to demolish the Bandali Dam) is using explosives to uncover diamonds lodged in the shoreline mud. He discovers a million dollar diamond and dials up his old smuggling contacts on his cellular phone. Suddenly, Cheetah creeps up and snatches the diamond. Lex recognizes Cheetah, and realizes that this is a good opportunity to get revenge on Tarzan. When Cheetah returns to camp, he turns over the diamond to Dan and Roger, who get visions of dollar signs flashing in their heads. Jane examines the gem and confirms their fantasies, this is a nearly perfect specimen. When Tarzan appears, he is angry that diamond mining has returned to his jungle. Jane realizes that the explosive mining could be dropping the water level. Tarzan races off to stop the suspected miners. After Tarzan leaves, Lex sneak into the camp and grabs Jane. He wants the diamond. Suddenly, Dan runs in with a shotgun. Lex uses Jane as human shield and makes Dan drop the rifle. He drags Jane tot he Jeep and drives off. As they are driving, Tarzan drops out of nowhere, landing on the hood of the Jeep. Lex hits the brakes and leaps from the Jeep. Tarzan nearly defeats Lex in a heated brawl, but Lex finds his pistol backs up to the river, and demands that they turn over the diamond. Without warning, an alligator vaults out of the water, clenches its jaws around Lex and pulls him back into the water. He never resurfaces. Roger and Dan put the diamond back in the mud, surrounded by amphibian eggs and cover them over. Jane is happy that the environment has been restored; both the animals and the minerals are in their natural homes.