John Reid (member of the Scientific Research League); Paul Vale (villain, scientist)
Synopsis
A scientist has created a serum when, mixed with blood and injected into a creature, allows that creature to grow as long as the scientist wishes, but also allows the injected animal to take on the characteristics of the animal from which the blood was taken. After a huge snake swallows the scientist, it grows into an even bigger giant guided by human intelligence that attacks New York City.
A betrothed couple purchases a strange antique clock. When the husband winds the clock backwards, he's sent thousands of years into the past and encounters a cult of demonic pagans who try to force him to sacrifice his wife in the present day, so time can loop with his sacrifice into the past thus allowing them to enter the modern world.