A mad scientist and his assistant are building a monster, who breaks free and rampages in the country. Superman, and Wonder Woman in her invisible plane, are flying on patrol when they spot the monster. The creature throws a gasoline tanker at them, and Superman files off to catch it. Wonder Woman lands and catches the monster in her golden lasso. The monster is strong, and during the struggle breaks a natural gas pipeline. Wonder Woman is overcome by the natural gas and passes out, and the monster takes Wonder Woman back to the mad scientist lab. Superman returns and finds Wonder Woman missing, and uses his x-ray vision to see the heat patterns of the monster's footsteps. Meanwhile the mad scientist plans to transfer Wonder Woman's mind into the creature body. Superman arrives just in tim