Scientist returns from Africa with a growth serum and injects a chimpanzee which grows into a gorilla He then sends it out to kill anyone who interferes with his plans. An overdose causes the gorilla to grow into a 30-foot monster.
American psychologist who doesn't believe in the supernatural comes to England for a conference. He runs afoul of Dr Julien Karswell, master of the occult, who is able to summon a demon to destroy anyone who crosses him.