Roger and Jane find a priceless dinosaur egg sitting in the middle of a mysterious field. An overzealous Roger gets too close to the field, causing underground eruptions from methane gas to blow their jeep sky high. Jane scolds him for ignoring her orders. Depressed, Roger wants to prove his manhood, and secretly tries to obtain the egg. Jane tries to get Tarzan to talk him out of it, fearing yet another disaster. Meanwhile Roger is in the field, and is being bombarded by explosions. Tarzan must decide the best way to help Roger find his lost confidence, while averting further disaster.