Konga(1961)

Dr. Decker has returned home after a year in Africa. Everyone thought he was dead. During this one year in Africa, he has found a way to grow plants and animals to gigantic sizes. He also brought a baby chimpanzee with him to test his theory. He has a lot of enemies at home, so he uses this chimpanzee, Konga, to get rid of them. Konga has grown to a gigantic size and razes the whole city of London to the ground...