Konga

Gough is a botany professor who returns to London, after a year in the jungle, with a serum extracted from a carnivorous plant. Injected into a chimpanzee, the serum causes the animal to grow to the size of a gorilla. Maddened by his new power, Gough hypnotizes the huge chimpanzee and has it kill his enemies, one of these being the boy friend of Gordon, with whom he has fallen in love. When Johns, Gough's assistant and girl friend, learns of his feelings toward Gordon, she injects Konga with a big dose of the serum. The ape grows to monstrous proportions, going on a rampage throughout London with Gough in its hand until the army stops it with rockets and machine gu...