A captain and his sailors investigate the rampaging "Marsh Phantoms" terrorizing a coastal town, but their search is hindered by a local reverend and a horrifying curse.

Years after fleeing his ancestral home with his mother, Jason returns home to claim his birthright, only to find his way blocked by his evil cousin Thomas. In order to reclaim his title, Jason must do battle with his cousin, who calls upon the members of the deadly Hellfire Club to stop him.

Dr. Decker returns from Africa after a year, presumed dead. In that year, he discovered a way of growing plants and animals to an enormous size. He brings back a baby chimpanzee to test out his theory. As he has many enemies at home, he decides to use his chimp, 'Konga', to 'get rid of them'. Then Konga grows to gigantic proportions and wreaks havoc all over London!